What are ways to strengthen enamel? ?

I have the same problem. My dentist recommended ACT fluoride rinse twice a day and i also have a prescription toothpaste (you have to buy from your dentist). It made by Colgate and has a higher fluoride content then toothpaste you buy at the store. last but not least you need a really good toothbrush. i use a sonicare. since i started this regime (9 years ago) i have not had a single cavity and my sensitive teeth have evened improved. good luck.