Wow - your story hits home!
My mother was on a course of antibiotics while pregnant with me and, lucky me, I ended up with incredibly porous teeth. Brushing 3x a day and flossing daily had little effect; until I started eating primally, I'd never had a dentist appointment that didn't require a filling. 6 months after starting a primal diet (years ago), I had my first cavity free check-up of my life. I've been a believer ever since.
Welcome and best of luck to you and yours!