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David Krutchkoff, DDS, MS

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The Silent Saboteurs: 
Unmasking Our Own Oral Spirochetes As The Key To Saving TRILLIONS in Health Care Costs

By William D. Nordquist, BS, DMD, MS
and David J. Krutchkoff, DDS, MS

236 Pages, $25.95

SUMMARY: In 2009, Dr. Nordquist published The Stealth Killer, a book that has become known as the #1 authoritative resource on the hugely important connection between oral spirochetosis and chronic inflammatory disease. 

Now, after having spent additional countless hours in deep study of the topic with co-author David Krutchkoff, DDS, MS, The Silent Saboteurs is here to expand on this groundbreaking subject. 

IN THE AUTHORS' OWN WORDS: “This is a story about a very special group of bacteria; uniquely different and interesting
microbes that live within our mouths. These peculiar forms of life, known collectively
as oral spirochetes, are unknown to most and misunderstood by nearly all. We have a story to tell concerning a proposed role these microbes play as saboteurs of our body defenses if allowed to penetrate our external surfaces thereby gaining access to the forbidden territory of our vulnerable internal body fluids. The ways, means and hows, are going to be presented along with rationales and suggestions of strategies by which these bacteria can be countered and what this will mean in terms of a better overall quality of life and savings to our health-care system. Prepare for an interesting read!”


“For too long healthcare has ignored the causative factors of disease and directed care to treating its symptoms. Dr. Nordquist outlines the evidence of the inflammatory process of disease and how bacteria, specifically spirochetes play a key factor. The ‘Silent Saboteurs’ opens the reader’s eyes to the broad and far reaching implications to healthcare that he outlined in his prior book, ‘The Stealth Killer’. This book is a must read for anyone involved in healthcare or the patient who is dealing with chronic illness.”

Private General Dental Practitioner, international lecturer and published author


Drs. Nordquist and Krutchkoff have done an exhaustive investigation into potential relationship of many chronic inflammatory diseases to oral microorganisms.There are many dogmas in the health professions that are considered inviolate. Are they? In my long career to date, I have observed numerous beliefs considered to be fact for years disproven by new evidence and clinical observation by motivated, unbiased investigators.

This book will stimulate your thinking relative to the relationship to oral and systemic health. It is a provocative and timely work. I congratulate the authors.

—Gordon J. Christensen, DDS MSD, PhD
Director, Practical Clinical Courses
Diplomate, American Board of Prosthodontics
Cofounder and Senior Consultant CR Foundation
Adjunct Professor, Brigham Young University and University of Utah

“Once again William Nordquist has produced a volume of work that should change the way we practice medicine and dentistry today.

In ‘Silent Saboteurs’ he expands and fleshes out the findings presented in his original book on spirochetosis, and it appears that the collaboration with oral pathologist David Krutchkoff has been quite beneficial.

How appropriate that ‘Silent Saboteurs’ will be coming out at around the same time as the formative meeting of professionals from many walks in medicine in dentistry as they are beginning the new American Academy of Oral/Systemic Health. It is becoming obvious that one cannot divorce one part of the body from another.

While ‘Silent Saboteurs’ is very well structured for reading by the medical professional, the writing is not so arcane and jargon-filled that it would not be accessible by many other ‘civilians’ and a valuable addition to any library. 

Conscientious, serious physicians and dentists need to absorb this text immediately if they wish to keep their practices on the cutting edge and optimize the health of their patients.”

—William C. Domb, DMD
Upland, CA
Director, Inland Aesthetic Dentistry Study Group
Editor, www.ZT4BG.com
Founding Member AAOSH


“The authors may have found the missing link between medicine and dentistry in general, and between oral spirochete infection and chronic inflammatory diseases in particular.

The chapter on the use of spirochetes as biological warfare is fascinating, making one wonder about the origin of the current epidemic of Lyme disease.

The chapter on Vitamin D reminds one to be careful about the recommendation of Vitamin D in the current Vitamin D deficiency ‘epidemic’.
Overall, as dentists, it is impressive that the authors have written more about medicine than dentistry. 

If future studies prove the connection, the authors will be known to have given a significant contribution to the understanding of human diseases.”

—Huy Hoang, M.D.
Natural Health Medical Center, Inc.


“Dr. Nordquist is a pioneer in the relationship of oral spirochetes to systemic chronic conditions. This new revelation will certainly help point layman and professional alike to consider a new focus on how to best help ourselves, families and patients into better lifetime health.”

—Douglas Martin DDS
Stockton, California 
Diplomate American Board of Oral Implantology/Implant Dentistry
Fellow American Academy of Implant Dentistry


“With a long clinical career and expertise in his field, Dr. Nordquist has written a fascinating book examining the connection between chronic systemic diseases and the presence of micro-organisms prevalent in periodontal disease, a subject that is of crucial importance both to society as a whole and to individuals. Dr. Nordquist’s book could dramatically improve the health of millions of individuals. If applied to our health care systems, the information in this book can change the way chronic diseases are treated in an aging population dealing with Alzheimer's, osteoporosis, heart disease, etc. Dr. Nordquist points the way to significant relief from the financial burden of health care cost on individuals and our society.

Dr. Nordquist writes, ‘In light of abundant emerging data, one cannot dismiss the possibility that at least some of the chronic systemic diseases may be causally linked to the presence of micro organisms prevalent in periodontal disease. This admittedly theoretical notion must be proven one way or the other, and this proof will only come about with carefully controlled scientific studies. As we clear away the detritus and elucidate the facts, the truth will ultimately prevail. Clearly, much remains to be done.’ 

Another wise man, Buddha said, ‘Believe nothing that you read, nothing that you hear, unless it agrees with your own reason and your own common sense.’ Dr. Nordquist’s book makes sense, and I believe you will find that it agrees with your own reason and your own common sense. We need to start harnessing the current knowledge about the potential link between periodontal disease and major chronic diseases and open the door to better understanding and better treatments. Dr. Nordquist’s book makes fascinating and provocative reading.”

—Israel Barken, MD 
Medical director 
Prostate Cancer Research and Education Foundation (PC-REF) 
501(c)3 nonprofit organization


“It appears likely that oral flora, especially in the context of inflammation and infection such as gingivitis, would cause systemic harm if entered into the circulation. This principle also applies to other circumstances where, in rare instances, ‘normal’ body compounds and flora leak out of their normal location such as the bile tract, colonic mucosa or skin. Although uncommon in these latter locations, the oral cavity is different in that ubiquitous trauma and infection opens ports of entry into the blood. There is anecdotal and circumstantial evidence that the entrance of oral bacteria and their products could cause significant internal injury such as facilitating, accelerating or perhaps initiating atherosclerosis, in particular, in the coronary arteries. The injury may happen indirectly through an immune response to the planted bacterial antigens.”

—Faripour Forouhar, MD
Professor of pathology
School of Medicine, University of Connecticut


“The authors’ relentless quest for knowledge regarding the silent destructive mechanism of spirochetes in their sabotage of the immune system is honest, pure and presented with great dignity. I believe that the authors have delved more deeply into this paramount important disaster that is taken place every day in patients’ mouths than any others who might have preceded them.

I also strongly feel the spirochete story will one day, in the very near future, be one of the main podium topics that will appear in most congresses throughout the world. To me, Dr. Nordquist is a true and honest genius who one day will be considered a legend in the field of medicine and dentistry.”

—Leonard I. Linkow DDS DMSc
Clinical professor, Dept. of Implant Dentistry, NYU College of Dentistry
Recipient of the Leonard I. Linkow Professorship of Implant Denti-stry, NYU College of Dentistry
LinkowLibrary.org: created by NYU, first digital library in the world
Author of 17 books on implant dentistry 

About Dr. Nordquist

Dr. William Nordquist is committed to excellence and has practiced dentistry in San Diego, California, since 1973. He received his Bachelor of Science in chemistry from the Rochester Institute of Technology (RIT) and worked for Eastman Kodak Company as an organic chemist. 

He received his Doctorate of Dental Medicine (DMD) and Master of Science from the University of Louisville. His Master of Science thesis and research produced many publications relating to surface chemistry of dental enamel and powdered and blocks of fluoro and hydroxyapatite (HA). He completed a general practice residency at the San Diego Naval Regional Medical Center and achieved the rank of lieutenant commander before leaving the Navy and setting up his private practice of dentistry in San Diego in 1976. He is a fellow in the American Academy of Implant Dentistry (AAID) and a diplomat in the American Board of Oral Implantology/Implant Dentistry (ABOI). Dr. Nordquist was named the 2008 International Dentist of the Year by the American Academy of Implant Dentistry. 

This is the second book written on the subject of Oral Spirochetosis. The first book, The Stealth Killer, has a detailed autobiography which can be reviewed if one would like to know more about me. So as not to repeat that particular descrip­tion of my life, I will add some detail of my association with David Krutchkoff, my co-author, which I didn’t mention previously, but is so important to where we are today.  

When I arrived in dental school in 1969, I was a fresh graduate of the Rochester Institute of Technology, where I majored in chemistry, and I had just completed a three-year cooperative program working as an organic chemist with the Eastman Kodak Company in Rochester, New York. Making the switch from pursuing a PhD program in chemistry to dentistry was done at the last minute and was based on the probability of being drafted into the military and serving in Vietnam, an idea which I did not savor. With a pure chemistry background centered in re­search, I was always interested in pursuing some avenue of research within the field of dentistry. During my second year, one of my professors, David Krutch­koff, an oral pathologist, was about to present his research to the dental and medi­cal school facility. By that time, he knew of my interest in research and invited me to attend.  

David’s research was very interesting and had to do with fluoride and its reac­tion with tooth surfaces. During his presentation, he expressed the idea that some of the recent infrared surface analysis data he had gathered might possibly have been an artifact rather than indicative of real physiochemical change. I had had experience with this type of phenomenon in my chemistry training, and during conversation following his lecture, I explained to him why I felt that the data was more likely an artifact or aberration due the limitations and characteristics of the scientific instrumentation he employed. He was impressed with my knowledge in this area, and that interaction started the sequence of events discussed in The Stealth Killer that lead to my pioneering a post-graduate Master of Science com­bined with the doctorate in Dentistry program at Louisville. Our first publication together as a team, about 18 months later, dealt with the proof of this observed change as artifact. The 3 year experience I received at Louisville with David and his research eventually led to the writing of my first book some 35 years later. During the research program at the University of Louisville, much writing was re­quired to not only finish the many research papers David and I published together, but also to complete my research thesis. Unfortunately, even though I could de­sign and implement research projects, I was not a talented writer. David was a very talented writer and a very tough mentor in this regard.  

On three occasions, I discussed with him in his office the lack of confidence I felt in completing the program since this writing task was so difficult for me. He refused to let me quit. I am so grateful today for his insistence that I persevere since none of my research accomplishments would have been possible without his pushing me on to complete this advanced research training in Oral Biology.  After my dental school experience and graduate program with David, I moved on to pursue a general practice residency in the United States Navy at the Naval Hospital in San Diego, and David moved to Connecticut. Then, in 1974, there came a time that some long-distance troubles arose between us with regard to the writing of a manuscript and its submission for publication. This difficulty plus the fact that both of us were busy with our new career objectives led to a abrupt halt in communication between us and the development of a 35 year hiatus in which there was absolutely no contact with one another.  

My autobiography in The Stealth Killer relates the fact that when my son reached junior high school, he was diagnosed with dyslexia. As this disorder, without question, is genetic and runs in families, the diagnosis of dyslexia in my son also presented the answer to the longstanding question of why I always had such trou­ble and difficulty with both language and writing. Clearly, I was always dyslexic but was never properly diagnosed. When The Stealth Killer was published, I reminisced about the early days and former times, particularly about my mentorship with David in the early 70s, and I concluded that he was so important in my life that I must reach out and attempt to contact him. When I finally did contact David, some 35 years later, I explained this dyslexic issue that made the post-doctoral program and writing chores so dif­ficult for me. Fortunately for me, he completely understood my difficulty during my graduate program and thereafter, and we thus became reunited academically after such a prolonged period of absence from one another. As you compare the writing style of The Stealth Killer to this latter work, you’ll note that this effort exhibits a more elegant, scholarly writing style which was due to David’s contri­bution. It is such a pleasure to once again be united with my former teacher, now Professor Emeritus of Oral Pathology at the University of Connecticut. He not only adds credibility to this most important work, but he has provided a much-needed sounding board to bounce ideas on and receive appropriate feedback. This has truly been a team effort, and the work itself is a testimony to this fact. I hope the reader enjoys this effort as much as David and I did putting it together.

Dr. Nordquist is performing ongoing research and a blog has been created to allow you to follow his work. On this page you will find videos and updates from Dr. Nordquist. The content is easy to access and provides an excellent supplement to this book. To follow Dr. Nordquist’s work, visit his blog.

Dr. Nordquist’s Dental Practice: 
Implant Dentistry of San Diego
2304 6th Avenue
San Diego, California 92101
(619) 236-7959


About Dr. Krutchkoff


The path that eventually led me to collaborate on this book has been both long and full of interesting twists and turns. One thing for sure is that along the way, from age alone, I have picked up considerable experience and, significantly, it is the fruits of this experience plus the occasional bits of wisdom gained therein that have allowed me a modicum of justification for making any contribution whatsoever to this work.

Looking back, although it hardly seems possible, it is now apparent that my interest and curiosity about pathology and its many constituent topics spans a period of nearly 50 years. Specifically, my primary interest is and has always been with disease in general and cancer in particular. My initial exposure to this as well as to other groups of diseases began in dental school at Washington University in St. Louis when, in 1961, I first encountered the topic of cancer within an academic primer course in general pathology. This course was a real eye-opener for me as it touched upon the basics of cancer and its many variations, and it was here that I discovered that I was at particularly high risk for development of skin cancer due to my fair skin and substantial exposure to the sun and its damaging effects while golfing as a teenager. In any case, then came graduation from dental school and clinical practice, which for me was three years of Navy duty as a general dentist. Here, I was able to keep my nascent interest in pathology and medicine alive in more unconventional ways than usually seen in dental practice by occasionally seeing hospitalized patients during medical rounds and dental consultations. Therefore, it is perhaps not surprising that when my Navy duty was over, it was followed by a graduate program and residency in Oral Pathology and Oral Diagnosis, both at Washington University and also at the University of Michigan in Ann Arbor. When it finally became time to actually get a job and go to work for a living, I took my first academic position in 1970 as an assistant professor of oral pathology at the University of Louisville School Of Dental Medicine. 

It was in Kentucky, shortly after getting settled at the University, that I first came into contact with the primary author of this book, Bill Nordquist. At the time (still 1970), he was a fledgling second-year dental student at the University of Louisville. For the record, I would like it to be known that Bill excelled in research even in these early days. In fact, he showed such promise, that a special program was initiated, primarily for him that would provide an avenue for Bill and other talented dental students of his like to pursue both a Dental degree and Master’s degree in Oral Biology simultaneously. Bill was the first graduate of this combined degree program earning both his DMD and MS degrees in May of 1973. 

I want to mention these details now as background to what follows. What has recently become very clear to me is that in spite of my excellent training plus the fact that I was charged with teaching students about a variety of diseases, the truth was that in these early days of my career, I knew very little about disease, particularly cancer. For sure, this was in part due to my inexperience. However, even more so, the fact was that, at the time, the extent of the available knowledge was so primitive, so full of voids and misconceptions relative to what it is known today, that, by comparison, it seems like most medical and dental professionals were essentially operating in the dark. 

In my case, it was only through the subsequent 25 to 30 years of experience at the University of Connecticut Health Center in Farmington beginning in 1973, that my knowledge base truly began to expand and blossom. It did so in the form of preparation for teaching students and residents, in participating in hospital activities including seeing cancer patients, in running a diagnostic teaching clinic, seeing my own patients, and associating constantly with talented dentists and physicians within my home-base of the Pathology Department in a modern medical center. That plus starting and running a biopsy service, initiating a graduate program, teaching graduate students, and doing the research all goes along with these activities, that I was able to begin to understand the group of diseases that we now have come to know collectively as cancer. Further, it is only by being constantly immersed within such an enriching environment that one can hope to keep pace with the advancing front of knowledge which has virtually exploded during the past 35 years or so. Thus it was with more than just a touch of irony that I realized that I was finally beginning to truly understand this vastly complex group of diseases, and this realization unfortunately came precisely at the time that I reached the age where I contemplated and then entered retirement. 

I’ve often thought about this paradoxical twist of fate and what a pity it is that one leaves their chosen field at just the time they are most competent and knowledgeable. Thus the opportunity, if not the responsibility, of being in a position to pass on this storehouse of experience to the brightest of younger generations, is abandoned at the time when it makes little if any sense. Accordingly, it is perhaps understandable that when Dr. Nordquist and I became re-united academically after I retired, and after some 35 years or so during which there was no contact between us whatsoever, it was, to say the least, a rejuvenating, re-awakening experience that jolted my academic juices back to action. Moreover, I cannot overstate the personal reward and pride I’ve experienced as a former teacher to see not only the first-rate professional development of one of my students, but also the academic curiosity and research interests that he has maintained throughout the years in addition to maintaining a busy solo, private practice. 

So it was that when we chatted out of the blue some 10 months ago in 2009, after such a long hiatus of time between us, it was as though we had never separated. After catching up on a lot of lost details, he asked me if I could possibly help him with some papers he was writing at the time, and I jumped at the chance. He later informed me that he was working on a rough draft of this book and offered me an invitation to collaborate as second author. It was an honor and an opportunity not to be passed up, and I immediately accepted. The personal academic re-invigoration experienced from this interaction has been immeasurable. Now a word or two about the subject matter of this treatise. In the interest of full disclosure, it must be admitted that initially, I was somewhat skeptical about much of what my former student was proposing. In fact, I am still skeptical about some of his theoretical concepts, and he is well aware of my concerns. On the other hand, as I began to dig deeper into his admittedly controversial but totally original working concepts, I began to come around to his way of thinking and appreciate the fact that there is a body of accumulating evidence to suggest that he may, in fact, really be on to something. Sure, it’s all brand new, “out-of-the-box” stuff that at this point seems unusual and certainly unproven. But, as one begins to see, there’s a lot of smoke amongst the pile of suspicions, real evidence and expanding data that indicate a smoldering, sub-surface fire of great significance soon to explode on the scientific scene. We hope the readers will also see and appreciate these approaching new horizons. As the book is now essentially finished, my only wish is that my efforts, admittedly mainly of an advisory and editorial nature as they are, add something positive to the overall quality and originality of Dr. Nordquist’s ideas that were virtually dumped in my lap for me to polish. If the book is improved with the relatively inconsequential input I contributed, so much the better. 


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