Gum Disease

A disease driven by one keystone bacterium

Gum disease, or periodontal disease, affects up to half the global population in some form, making it one of the most common chronic conditions there is. It starts as gingivitis, inflammation of the gums, and can progress to periodontitis, where the deeper structures holding teeth in place break down. A single bacterium plays an outsized role in that progression. Porphyromonas gingivalis was found in 78% of people with chronic periodontitis in one culture study, compared with 34% of people with healthy gums. Researchers call it a keystone pathogen, because even in small numbers it can disrupt the balance of the whole oral microbiome, encouraging other harmful bacteria to flourish and driving the immune system into a state of chronic, damaging inflammation.

Source: An Anaerobic Culture Study to Assess the Prevalence of Porphyromonas gingivalis in Periodontal Disease Incidences Among Adults

Source: Periodontal Disease and Its Association with Porphyromonas gingivalis

Specific probiotic strains show a measurable effect

Multiple randomised controlled trials have tested probiotics as an add-on to standard gum treatment, which is scaling and root planing to physically remove the bacterial biofilm. A systematic review of these trials found that a specific strain, Lactobacillus reuteri, taken as a daily lozenge alongside treatment, reduced probing pocket depth, a direct measure of gum damage, more than treatment alone. Individual trials have found reductions in bleeding on probing and gum inflammation too, with one trial reporting a 31% greater reduction in gum bleeding with a specific probiotic strain compared with placebo.

As with any probiotic, strain matters here more than the general idea of "taking a probiotic." The trials showing benefit used specific, tested strains at specific doses, delivered in specific ways, such as a lozenge held in the mouth rather than a swallowed capsule, since the bacteria need to reach the gum pockets directly to have an effect. It's also worth remembering that a probiotic only introduces bacteria, it doesn't feed them. Newly introduced strains still need an ongoing supply of fibre and plant compounds to survive and keep doing their job, much like a zoo that brings in new animals but stops feeding them will simply lose them again.

Source: Probiotics in the Management of Gingivitis and Periodontitis. A Review

A two-way link with blood sugar

Gum disease and diabetes affect each other in both directions. People with diabetes have two to three times the risk of developing gum disease compared with people without it, particularly when blood sugar is poorly controlled. The reverse also holds. Treating gum disease has been shown, across multiple trials, to modestly improve blood sugar control in people with diabetes, lowering HbA1c, a marker of average blood sugar over the previous few months, by around 0.3 to 0.4 percentage points.

Source: Diabetes and periodontal disease: a two-way relationship

What this means for you

Gum disease is best caught early, since periodontitis-stage damage to bone and gum tissue can't be fully reversed, only managed. Bleeding gums, persistent bad breath, loose teeth, or receding gums are worth a dental check-up rather than waiting it out. Alongside professional cleaning and good brushing and flossing habits, the trial evidence above is a reasonable basis for asking a dentist whether a specific probiotic lozenge might help as an add-on, not a replacement for treatment. A varied, plant-rich diet supports the same balance between helpful and harmful bacteria that these trials are trying to restore directly. That's the same idea behind GutLab, everyday gut health starts with regularly feeding the microbiome a broad range of plant-rich ingredients.