New Oral Care Products Aim to Boost 'Good' Bacteria, But Experts Urge Caution

An imbalance in the oral microbiome, the community of microorganisms residing in the mouth, is increasingly linked to a range of serious health issues, including cardiovascular disease, depression, Alzheimer's, diabetes, and certain cancers. Research published in JAMA Oncology last year indicated that 'bad' oral bacteria, such as Porphyromonas gingivalis, are significant risk factors for pancreatic cancer.

In response to these findings, a growing number of products are emerging that claim to support a healthier oral microbiome. These range from chewable probiotic tablets and powders to specialized toothpastes and lozenges, all designed to either introduce beneficial bacteria or avoid disrupting the existing balance.

James Goolnik, a dentist and oral microbiome expert, has assessed several of these products, providing insights into their potential benefits and limitations.

Oral Probiotic Supplements

Healthspan Oral Health Biotic tablets contain Streptococcus salivarius K12 and M18, two probiotic strains naturally found in the mouth known for potentially reducing plaque and bad breath. Goolnik rates this product 7/10, noting its credibility over gut probiotics marketed for oral health. However, he pointed out a lack of independent studies confirming the viability of the stated bacteria throughout the product's shelf life.

Invivo Bio.me Oral Supplement, a powder with eight strains of Bifidobacterium and Lactobacillus, received a 3/10 rating. While individual strains have shown promise in improving bleeding gums and bad breath, Goolnik noted a lack of human trials proving this specific product's efficacy in reducing harmful bacteria or colonizing the mouth. Its use as a mouthwash, however, could offer direct contact with oral tissues.

Luv Biotics Dental Hygiene Lozenges, containing Lactobacillus reuteri SGL01, were rated 4/10. A 2026 study suggested this strain could inhibit the growth of Streptococcus mutans, a bacterium linked to tooth decay. However, this was a laboratory study, and more research is needed. Goolnik also highlighted that the lozenges do not contain fluoride and a month's supply is costly, suggesting traditional brushing with fluoride toothpaste is effective at removing biofilms.

Biome Dental Sachets scored 8/10 and are considered one of the stronger probiotic options due to their inclusion of four identified live strains—Lactobacillus helveticus Rosell-52, Lactobacillus rhamnosus Rosell-11, Bifidobacterium longum Rosell-175, and Saccharomyces boulardii CNCM I-1079. Research associated with this combination has reported reductions in plaque and gum inflammation compared to a placebo. Goolnik expressed a desire for larger independent trials, but noted the convenient sachet format, while expensive at £34.99 for 28 sachets.

Specialized Toothpastes

Gutology Mineral Toothpaste, priced at £38.70 for three tubes, contains Lactobacillus plantarum HEAL19, described as a 'postbiotic' that supports existing oral bacteria. It has received a 'kind to biome' certification. Goolnik rated it 5/10, stating that while it avoids harsh ingredients, the company has yet to establish its ability to actively rebalance the microbiome through clinical trials. The toothpaste is fluoride-free, relying instead on hydroxyapatite to strengthen enamel, though evidence for fluoride's decay-preventing effects is stronger.

Bio Balance Toothpaste, costing £23.88 for three, uses heat-treated Lactobacillus (paraprobiotics). Goolnik gave it a 6/10, acknowledging research that suggests these inactivated bacteria can help support key bacteria in the mouth and potentially reduce harmful ones. However, he noted a lack of evidence that this effect translates to the finished toothpaste product. The product does contain fluoride.

Expert Perspective

While some products show promise, experts emphasize the need for more robust, independent human studies to confirm their efficacy. The viability and colonization of live bacteria, the specific impact on harmful microbes, and long-term oral health benefits remain areas requiring further investigation. Traditional oral hygiene practices, including twice-daily brushing with fluoride toothpaste and flossing, continue to be the cornerstone of maintaining oral health.