You guys who all immediately think dentists give you good teeth are missing the point. Dentists can repair (and sometimes make a lot worse) problems, but tooth health comes strictly from diet and home care.
There is an excellent book to help you by Ramiel Nagel. I forget the exact title but look it up. Something to do with healthy teeth. It will teach you how to heal your own cavities. It works; I’ve done it. Adding fat from healthy animals - meat and dairy - supplementing with k2 etc.