What are somethings I can do to help my enamel and the strength of my teeth?

I'm only 20 years old, and though my teeth look nice up close they are cracked and the cracks have progressively gotten worse. My teeth have always been cavity prone since I was a kid, but now I'm starting to take things a little more seriously. My husband and mother in law have noticed the cracks in my teeth have gotten progressively worse in the last few months. So I know I'm not just being paranoid. Is there anything I can do to help stop this and possibly turn things around?