Oral Care: You Are Literally Putting This in Your Mouth

The mouth is one of the highest-absorption surfaces in the body. Medications administered sublingually (under the tongue) absorb faster than most other delivery methods. The mucous membranes in your mouth are thin, highly vascularized, and allow rapid transport of substances into the bloodstream. This means toothpaste ingredients that stay in your mouth for two minutes twice a day, and mouthwash you swish for 30 to 60 seconds, have real absorption potential.

The SLS Problem in Toothpaste

Most conventional toothpastes contain sodium lauryl sulfate as a foaming agent. This is the same ingredient from body wash and shampoo. SLS is what creates that foamy texture that makes brushing feel thorough. Research has found that SLS in toothpaste is a significant trigger for recurrent aphthous ulcers, commonly called canker sores. Studies have found that people who switch to SLS-free toothpaste have meaningful reductions in canker sore frequency.

Artificial dyes are present in many popular toothpastes, particularly those marketed to children. Blue 1 is used in several major brands just to make the paste look more appealing. It has no functional purpose in oral health. Artificial sweeteners like saccharin are common in toothpaste, and some research suggests they may alter gut microbiome composition even in small amounts.

The Fluoride Question

Fluoride is extremely effective at preventing cavities and is endorsed by essentially every major dental organization. The concerns about fluoride center on fluorosis (cosmetic white spots on teeth from too much fluoride during tooth development) and at very high exposures, potential neurological effects. The key is appropriate dosing: the amount in toothpaste used properly by adults is considered safe and beneficial. Children should use smaller amounts and not swallow toothpaste.

An alternative is hydroxyapatite, the natural mineral that makes up tooth enamel. It has strong evidence for cavity prevention without the fluoride concerns and is increasingly used in cleaner toothpaste formulas.

Alcohol Mouthwash

Alcohol kills bacteria effectively, but it kills beneficial bacteria along with harmful ones, disrupting the oral microbiome. Some research has suggested that long-term daily use of alcohol-based mouthwash may be associated with elevated oral cancer risk, though this is still being studied. Alcohol-free options that use alternative antimicrobial agents are widely available and work well.