Could a Tiny Probiotic Be the Missing Piece in Your Oral Health Routine? Here's What Science Says About Lactobacillus reuteri
By Aster Natura Health Editorial Team
Most people think brushing twice a day and flossing regularly are all it takes to maintain healthy teeth and gums. While those habits remain the foundation of good oral hygiene, researchers are discovering another important factor that many people have never considered—the oral microbiome.
Your mouth is home to more than 700 species of microorganisms. Some help protect your teeth and gums, while others contribute to cavities, bad breath, plaque buildup, and gum disease when they become too abundant.
In recent years, scientists have begun exploring whether probiotics—the "good bacteria" commonly associated with digestive health—can also support a healthier mouth. One probiotic attracting particular attention is Lactobacillus reuteri.
Although research is still evolving, studies suggest that certain strains of Lactobacillus reuteri may help support healthier gums, reduce harmful oral bacteria, and contribute to a better-balanced oral microbiome.
Here's what current science tells us.
Your Mouth Has Its Own Microbiome
Just like your gut, your mouth contains a complex ecosystem of bacteria.
In a healthy mouth, beneficial and potentially harmful bacteria exist in balance. Problems begin when harmful bacteria multiply faster than beneficial ones.
This imbalance—known as oral dysbiosis—has been associated with:
- Gingivitis
- Periodontitis (gum disease)
- Dental plaque
- Tooth decay
- Persistent bad breath
- Gum inflammation
Traditional oral care focuses on removing bacteria through brushing, flossing, and professional cleanings.
Researchers are now asking a different question:
What if improving the balance of beneficial bacteria could also support oral health?
Meet Lactobacillus reuteri
Lactobacillus reuteri is a naturally occurring probiotic found in the human digestive tract, mouth, and breast milk.
Unlike many probiotic species that mainly influence gut health, certain strains of L. reuteri have demonstrated an ability to survive in the oral cavity for a period of time, allowing them to interact directly with oral bacteria.
Scientists have studied this probiotic for decades because of one particularly interesting characteristic.
It produces a natural antimicrobial substance called reuterin.
Rather than indiscriminately killing bacteria, reuterin appears to inhibit the growth of several potentially harmful microorganisms while allowing many beneficial bacteria to remain.
This makes L. reuteri especially interesting for maintaining microbial balance.
Why Gum Health Matters More Than You Think
Many Americans consider bleeding gums to be a minor inconvenience.
Dentists disagree.
Bleeding during brushing is often one of the earliest signs of gingivitis—the first stage of gum disease.
According to the Centers for Disease Control and Prevention (CDC), nearly half of adults aged 30 years and older in the United States have some form of periodontal disease.
Left untreated, chronic inflammation around the gums can gradually damage the tissues and bone supporting the teeth.
Researchers have become increasingly interested in whether probiotics might complement—not replace—standard dental care.
What Research Says About Lactobacillus reuteri and Gum Health
Several clinical studies have examined oral probiotic supplements containing specific strains of Lactobacillus reuteri.
Results suggest that these probiotics may help:
Support Healthier Gums
Participants in several studies experienced reductions in gum inflammation after using L. reuteri alongside regular brushing.
Researchers believe this may occur because beneficial bacteria compete with harmful bacteria that contribute to gingivitis.
Reduce Dental Plaque
Dental plaque is a sticky bacterial biofilm that forms on teeth.
If not removed regularly, plaque can harden into tartar and contribute to gum disease.
Some studies have found that L. reuteri supplementation was associated with lower plaque scores compared with placebo, although results vary among studies.
Help Manage Bad Breath
Bad breath (halitosis) is often caused by bacteria that produce sulfur-containing compounds.
By influencing the balance of oral bacteria, certain probiotic strains may help reduce the populations of odor-producing microbes.
However, persistent bad breath should always be evaluated by a dentist or physician because it may signal an underlying condition.
Reduce Harmful Oral Bacteria
Researchers have reported decreases in bacteria commonly associated with gum disease, including Porphyromonas gingivalis, after supplementation with certain L. reuteri strains.
This does not mean harmful bacteria disappear entirely.
Instead, probiotics appear to help create a healthier microbial balance.
It's About Balance—Not Sterilization
Many antibacterial mouthwashes are designed to reduce bacteria broadly.
While this can be useful in some situations, researchers increasingly recognize that not all bacteria are bad.
The goal isn't to eliminate bacteria altogether.
It's to maintain a healthy ecosystem where beneficial microorganisms help keep harmful species under control.
This concept is similar to maintaining a healthy gut microbiome.
Not Every Lactobacillus reuteri Is the Same
One of the biggest misconceptions about probiotics is assuming that all strains work identically.
They don't.
Scientific research is strain-specific.
For example:
- DSM 17938 has been extensively studied for digestive health.
- ATCC PTA 5289 has been investigated for oral health.
- ATCC PTA 6475 has been studied for immune and bone health.
Simply seeing "Lactobacillus reuteri" on a product label doesn't necessarily mean the product has been clinically studied for oral health.
Consumers should always look for clearly identified probiotic strains whenever possible.
Can Probiotics Replace Brushing?
Absolutely not.
Even the most promising probiotic cannot remove food debris or hardened plaque.
Dentists continue to recommend:
- Brushing twice daily with fluoride toothpaste
- Flossing every day
- Regular professional cleanings
- Limiting sugary snacks and beverages
- Staying hydrated
- Avoiding tobacco products
Probiotics should be viewed as a potential complement to these habits—not a substitute.
Who Might Consider an Oral Probiotic?
Some people choose oral probiotics because they are interested in supporting a balanced oral microbiome as part of a broader wellness routine.
Individuals who may wish to discuss oral probiotics with their dental professional include those who:
- Experience recurring gum irritation
- Want additional support for oral hygiene
- Frequently struggle with bad breath
- Have recently completed dental treatment
- Are interested in microbiome-based wellness approaches
Anyone with significant dental symptoms, persistent bleeding gums, loose teeth, or severe pain should seek professional dental care promptly.
Are They Safe?
For most healthy adults, probiotics are generally considered safe.
Some people experience mild digestive symptoms when first starting a probiotic, but these usually resolve within a few days.
Individuals with severely compromised immune systems or serious underlying medical conditions should consult a healthcare provider before taking probiotic supplements.
The Future of Oral Health May Include Beneficial Bacteria
For decades, dentistry focused primarily on removing bacteria.
Today, researchers increasingly recognize that supporting beneficial bacteria may also play an important role in maintaining oral health.
While probiotics are not miracle cures, growing scientific evidence suggests that carefully selected strains of Lactobacillus reuteri may help support healthier gums, reduce harmful oral bacteria, and contribute to a more balanced oral microbiome when used alongside good oral hygiene practices.
As research continues, oral probiotics may become an increasingly valuable part of preventive dental care.
Final Thoughts
Healthy teeth begin with healthy habits—but science suggests they may also begin with a healthy microbial community.
If you're curious about probiotics, look for products that clearly identify the probiotic strains they contain, follow the recommended directions for use, and continue practicing excellent oral hygiene every day.
No supplement can replace regular dental visits, but the right probiotic may become a valuable addition to a comprehensive oral health routine.
Interested in Learning More?
If you'd like to explore one oral probiotic supplement available on the market, you can learn more about it here:
As with any dietary supplement, take time to review the ingredient list, the probiotic strains included, and any available supporting information. If you have ongoing dental problems or underlying medical conditions, consult your dentist or healthcare provider before adding a new supplement to your routine.
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