Actually, that is not true. Oral fluoride can help strengthen the enamel of your teeth and help strengthen your teeth. Fluoride is actually incorporated into your teeth (and bones) when you are growing.
It does alot more than just having a topical treatment. It doesn't do alot to take oral fluoride drops after puberty, after your enamel and teeth have fully formed.
I have wondered if really high doses of fluoride in the fetus or young children could cause bone cancer since it is incorporated into bone along with calcium and phosphorus. I could not find a link suggesting that.
It should be regarded as a drug since it is incorporated forever into your bone and teeth.
