The best weapon against cavity-causing bacteria doesn’t kill them–it tricks them.
Flossing until your fingers ache, vigorously swishing mouthwash, and tongue scraping are all part of a nightly ritual that makes you think you are doing everything right—yet your dental visits often tell a different story. Your gums continue to recede, and a new cavity appears despite all this work.
Better oral health does not always come from a more meticulous bedtime routine. Cavities, gum disease, and chronic bad breath are often a result of conditions in your mouth that favor certain bacteria over others.
Surprisingly, one of the most studied tools in oral health is xylitol, a type of sugar alcohol that looks and tastes like regular sugar but behaves differently in the mouth. It is found in small amounts in fruits and vegetables and is commonly used in sugar-free gums, mints, and oral care products.
Unlike regular sugar, it does not feed the bacteria responsible for cavities and gum disease, which is why researchers have been studying its effects on the body, including its effects on oral health, for decades.
A Complex Ecosystem Under Threat
The oral microbiome, or the balance of bacteria in the mouth, is one of the most complex systems in the human body. Hundreds of bacterial species live on teeth, gums, the tongue, and soft tissues. Some help protect your mouth, while others cause problems as they grow.
The issue comes down to metabolism. Certain oral bacteria are especially efficient at using sugar as fuel, and when that fuel is consistently introduced through sugary food and drinks, it changes the chemistry in your mouth. The environment becomes more acidic, and enamel becomes more vulnerable.
One of the best-known examples is Streptococcus mutans (S. mutans), a bacterium known to cause cavities. “Regular sugars like glucose and sucrose are ideal fuel for Streptococcus mutans, the main cavity-causing bacteria. They metabolize these sugars and release acids that drop the pH in your mouth (often below 5.5), which weakens enamel and leads to cavities,” Heather Paul, a certified biological dental hygienist and orofacial myofunctional therapist, told The Epoch Times.
A mouth that is often exposed to sugar results in sticky, plaque-forming bacteria taking over while decreasing helpful microbes. Over time, this imbalance can also contribute to ongoing inflammation throughout the body.
Two main groups of harmful oral bacteria are responsible for most dental disease, according to Dr. Mark Cannon, a professor of otolaryngology at the Division of Dentistry at Northwestern University, Feinberg School of Medicine. One group drives tooth decay, while the other is linked to gum disease. “Over the last two decades, thousands of publications have shown that both of these pathogenic groups can initiate systemic illness,” Cannon told The Epoch Times.
Cannon’s assessment is supported by a large 2022 review published in Nature Communications, which analyzed nearly 300 meta-analyses linking chronic oral diseases such as tooth decay, gum disease, and tooth loss to inflammation and a wide range of conditions affecting the heart, metabolism, immune system, and brain.
This is where conventional approaches often miss the mark. Products designed to wipe out bacteria indiscriminately can do more harm than good. “Using high-alcohol-content or prescription mouthwashes, or anything that claims it kills 99.9 percent of the bacteria is also killing the commensals, which are the bacteria that help us digest our food,” Cannon said.
The focus on eliminating bacteria rather than changing the environment is something Nate Jones, founder of a company that produces xylitol-based oral and nasal products, believes has slowed progress in oral health. “We have known for decades that tooth decay is a simple bacterial infection,” Jones told The Epoch Times. “If we want to improve oral health, we need to address that infection.”
He argues that fluoride-based approaches stop short of doing that. “Fluoride makes the enamel more resistant to acid, but it does not treat the bacterial infection,” he said.
