[zeteo]

+1 for mastic, completely nontoxic and it's been used for thousands of years. My cavity problems have pretty much disappeared since discovering it several years ago.

[nikolay]

Yup! Here's one study [0]!

[0]: https://pubmed.ncbi.nlm.nih.gov/12747455/

[SkyMarshal]

Any brand you recommend?

[zeteo]

For someone trying it for the first time, I would recommend the Falim chewing gum, available on Amazon, or the mint-flavored toothpaste at mastic.gr. If you feel comfortable trying pure mastic, the best quality that I've found are the large tears from Chios Mastiha Growers Association.