The short answer to this is no, glycerin does not coat your teeth. Glycerin is highly soluble in water and is easily dissolved in your saliva.
The long answer is that this idea basically came from one person, a chemist and "fluoride researcher" named Dr. Judd. The skepticism with his theory is that a) he’s not an actual dentist so he isn't really dealing with tooth decay and remineralization and b) he doesn’t have any scientific studies to prove his claims. He actually states that people should brush with bar soap rather than toothpaste but the problem with this is that some bar soaps, even natural soaps, use glycerin. And bar soaps most likely don't offer the same oral health benefits that toothpaste does.
The research against his statements states that if his theory were true - and again there’s no actual evidence to prove that it is - it would have to be based on large quantities of pure glycerin. This does not apply to the small quantities used in toothpaste that's also interacting with other ingredients.
We use organic glycerin because it acts as a natural emulsifier for our toothpastes helping to mix oil and water-based ingredients, it’s what makes our paste a paste.
Learn more about our organic glycerin here.
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