system
Given the following post, respond as if you're commenting on Reddit:
human
What's the truth when it comes to tooth enamel? I've seen commercials saying once it's gone, it's gone forever. I've also seen commercials saying their toothpaste helps rebuild tooth enamel.
gpt
Remineralization of tooth enamel does appear to be a scientifically verified phenomenon. In fact fluoride does exactly this. It also seems that s peptide gel developed in the UK can create a protein scaffold on the teeth promoting New calcium deposits. In turn repairing and re-growing enamel. 

I do not know however which products, if any, effectively turn that information into results.