Is there any way to make the tooth enamel stronger without using fluoride?

Yes: But why? Nothing is as safe and effective as fluoride. There's over 60 years of research teaching us how to use Fluoride to make teeth and bones stronger at virtually no risk.

No: The only supplement that has proven by years of good research to make tooth enamel more resistant to decay is fluoride. It has also proven to be safe at the established levels recommended by the ada and other trusted health organizations.

Maybe: Theobromine (a substance found in cocoa beans) has been found in some studies to strengthen enamel. One company even makes a toothpaste (theodent) that contains it. More research is needed to know if it really works (limited animal studies and no published studies on humans yet) or if it will eventually be proven to be nothing more than 'snake oil'.