system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is glycerin such a common ingredient in toothpaste even though some studies have apparently shown that it prevents the remineralization of the enamel?
gpt
Glycerin is in a lot of agents and products.  It's in medications, topical products, food... it has a lot of favorable properties.  It can be a humectant (it keeps the product from drying out), emollient (has moisturizing properties), can be a solvent (it dissolves something so that you can add it to an ingredient that wouldn't dissolve it), has antimicrobial properties, and has a sweet taste.  Google results for "glycerin and enamel" have countless ridiculous websites spouting nonsense.  PubMed has no clinical trials about glycerin wearing down enamel.  Please correct me with some information on what studies were conducted.