@kitchenerkrowndental: Softened enamel can harden back up. Saliva and fluoride push the minerals back in, and early decay reverses on its own. That window closes the second the surface actually breaks. After that it is a filling, because enamel does not regrow. Anyone ever been told there's a spot they're "keeping an eye on"? #toothdecay #oralhealth #dental #dentaltok #cavities