Hydroxyapatite toothpaste is a fluoride-free option that has some research backing its effectiveness. mihailomilovanovic/Getty Images hide caption toggle caption i mihailomilovanovic/Getty Images How you brush your teeth — and what you use to do it — matters. Recently, dentist Dr. Jin-Ho Phark says he’s noticed patients asking about fluoride-free toothpaste options. Phark is an associate
