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The Science of Prevention & Hygiene

Oral Probiotics: Re-engineering Your Mouth’s Microbiome

By Dr. Mariam Tariri
Oral Probiotics: Re-engineering Your Mouth’s Microbiome

For decades, the standard approach to dental hygiene has been a "scorched earth" policy: use potent, stinging mouthwashes to chemically annihilate every bacterium in the mouth.

However, modern microbiology has revealed that the mouth is a delicate ecosystem. When you destroy all bacteria, the aggressive, disease-causing strains are usually the fastest to repopulate. Today, leading clinicians are taking a new approach: Oral Probiotics.

The Mechanism of "Competitive Exclusion"

Instead of trying to sterilize the mouth, oral probiotics involve deliberately flooding the oral cavity with billions of benign, highly beneficial bacterial strains.

Because space and nutrients on the teeth and gums are strictly limited, these massive armies of "good" bacteria essentially claim all available real estate. When the "bad" bacteria attempt to colonize, there is simply no room for them to attach. This biological phenomenon is known as competitive exclusion.

The Two Heavyweight Strains

Extensive clinical trials by the NIH have identified two specific strains of bacteria that produce extraordinary outcomes for dental patients:

  1. Streptococcus salivarius M18: This incredible strain actively hunts down Streptococcus mutans (the specific bacteria entirely responsible for causing tooth decay). M18 secretes specialized antimicrobial proteins that inhibit the decay pathway and even releases enzymes that neutralize the acid produced after you eat sugar.
  2. Streptococcus salivarius K12: This is the ultimate weapon against chronic Halitosis (bad breath). The bad breath you smell is actually "Volatile Sulfur Compounds" (VSCs) emitted by nasty bacteria hiding on the back of your tongue. K12 aggressively colonizes the tongue and throat, physically blocking the VSC-producing bacteria from taking hold. Clinical studies show dramatic, long-lasting reductions in measurable bad breath after incorporating K12 lozenges.

You cannot drill your way out of a bacterial infection. By strategically re-engineering your oral microbiome, you can stop the diseases of the mouth before they ever begin.


Are you struggling with chronic bad breath despite impeccable brushing, or constantly battling new cavities? You might have an imbalanced oral microbiome. At Órale Care in Kirkland, we analyze your bacterial risk profile and integrate clinical-grade oral probiotic therapies into your preventative regimen, allowing your biology to naturally defend itself. Schedule a preventative consultation today.

Dr. Mariam Tariri

Dr. Mariam Tariri

Lead Dentist, DDS

Dr. Mariam Tariri is a graduate of the University of Washington School of Dentistry and is dedicated to providing conservative, precise dental care to the Kirkland community. She is an active member of the ADA and WSDA.

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Medical Disclaimer: The information provided on the Órale Care website is for educational and informational purposes only. It is not intended as a substitute for professional dental or medical advice, diagnosis, or treatment. Always seek the advice of your dentist or other qualified healthcare provider with any questions you may have regarding a medical condition or treatment.