Maintaining the integrity of your mouth Teeth are tough. Formed from the hardest substances in the body, they're harder even than bone. But they're not indestructible. Throughout life teeth are subject to injury—maybe it will be a blow from a hockey puck in your twenties. Or a luckless chomp on an unseen popcorn kernel in your thirties. Or a molar that's had one too many fillings in your forties. Whatever [...]