Endodontics of OC
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Peter D. Cancellier, D.D.S.

33 Creek Road, Suite 330
Irvine, CA 92604

Office Hours: Monday - Thursday
8:00AM - 5:00PM

We specialize in Endodontics: the diagnosis and treatment of dental disease that affects the blood vessels and nerve tissues (pulp) located in the center of tooth roots.

We are about quality, appropriate treatment, and ethics. We are not going to recommend a procedure unless we think it will leave you symptom-free. We use the best equipment and materials available. We use techniques that offer the best success rate based on scientific evidence. We take the time to do it right the first time. That being said, if you tooth doesn’t settle down, we will retreat your tooth at no charge as long as you return within a year.

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Dr. Cancellier is the best.  I had no pain from the procedure, he explained everything completely, he checked in with me after the procedure and I am very pleased.  I had 3 root canals at the office and I would not go anywhere else.


We understand going to a new dentist for the first time is not on your bucket list. Say the word Endodontist and, like many people, you don't know what the word means. Then when you find out that 'Endo' is the Greek word for 'inside' and 'odont' is the Greek word for 'tooth', you realize that an Endodontist is a Root Canal Specialist.

Endodontics of Orange County, Dr. Peter Cancellier's Endodontic Specialty Practice is centered on creating a low stress, positive experience in every way. We are Professional, Understanding, Respectful, Caring, and Gentle. We use every available technique and medication to offer painless care. Our clinical goal is to provide endodontic treatment that helps your tooth function without discomfort for the rest of your life.

We believe that with a commitment to excellence for every patient, properly diagnosed root canal treatment or re-treatment or root-end surgery are desirable alternatives to extraction and a bridge or an implant. Dr. Cancellier has implant training and has placed implants, but he only performs endodontic treatment. Local implant dentists refer patients to him because they know he will not recommend endodontic treatment unless it is the appropriate choice.

Peter D. Cancellier graduated from the University of the Pacific with degrees in Biology and Communications Arts. Before entering dental school, he worked with his father as a flower grower in Cardiff, California.

Dr. Cancellier obtained his Doctor of Dental Surgery degree in 1982 from the University of the Pacific School of Dentistry. He practiced general dentistry in Los Angeles with Guy Ho, a member of the USC Dental School Hall of Fame. In 1988, Dr. Cancellier completed a two-year residency in endodontics at the Veterans Administration Medical Center in Long Beach, California. Since then he has practiced and taught endodontics.

Dr. Cancellier’s Endodontics of Orange County office is a full-time specialty practice in Irvine, California. For several years, Dr. Cancellier taught at the Herman Ostrow School of Dentistry of USC Advanced Endodontic Residency as an Associate Professor.

Dr. Cancellier is a Diplomate of the American Board of Endodontics, a member of the American Association of Endodontists, American Dental Association, California Dental Association, Orange County Dental Society, an Honorary Member of the Warm Gutta Percha Study Club of Italy, an International Editor of the Giornale Italiano di Endodonzia, and he is Past President of the California State Association of Endodontists.

Help! I'm In A LOT Of Pain!

At the first sign of dental pain that is spontaneous or lingering pain from biting or cold and hot foods, schedule an appointment for diagnosis. On the day of your appointment, do not take any pain medications, if possible.

Fortunately, for those without medical restrictions, nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen (Advil and Motrin) and naproxen sodium (Aleve), block the production of pain stimulating factors usually created during dental pain. If approved by your doctor, take as directed. Once the pain in controlled, continue taking NSAIDs, following the manufacturers dose and time regimen.

Research shows that NSAIDs are more effective than narcotics. NSAIDs block the pain at the site of the pain stimulating factors. Narcotics like hydrocodone and codeine, work from the central nervous system. They make you care less about the pain, but the pain is still there. If you end up using a narcotic, don’t stop taking the NSAID.


Endodontic disease is a bacterial disease. Bacteria that enter the tooth as decay, progress toward the pulp (blood vessels and nerve tissue in the center of the roots). The body’s self defense system responds with chronic inflammation.

Specialized cells exit the blood via the smallest blood vessels, capillaries. The capillaries open a space large enough for the defense cells to exit the blood and manage the bacterial assault on the pulp tissue. These chronic white blood cells work without sending information to pain receptors.


Most cavities develop without any symptoms. That is why regular checkups are so important. Catching tooth decay promptly means only a small filling is needed.

Without regular checkups, the tooth decay progresses and the chronic inflammatory process not only defends against the bacterial assault, but also destroys healthy pulp tissue, replacing it with too many small blood vessels, disrupting the blood flow. Now the pulp is weakened and the decay is threatening to destroy tooth structure to a level that may prevent restoring the tooth.

The acute defense cells finally enter the pulpal tissues, usually when you are especially stressed, whether from work, family, or an upcoming vacation. Finally, our body informs us of the problem. A by-product of the acute inflammatory process is the production of pain stimulating factors.

Get an appointment as soon as you can. We accommodate emergency patients, usually on the same day of your call. On the day of your appointment, do not take any pain medications, if possible.