it's not banned in the us. toothpaste is regulated as a drug in the us, and the fda requires all kinds of tests proving any claims you make about drugs. if you claim novamin fixes your teeth or whatever, then gsk has to do testing to prove that. canada and most other places regulate toothpaste as a cosmetic, and the burden of proof is lower. also you can get that stuff on amazon with free prime shipping:   otect-toothpaste-powered-novamin/dp /b01dpmx7w2/
United States