Caps. They grind your tooth away then stick a cap on it. I have got one. L/H front incisor. It is fine but every now and then I try to rip through the plastic packaging of my latest computer accessory with my teeth and the ******* thing springs loose. So I dry out the socket with the wife's hair dryer then use Superglue to glue it back in. Until the next time the thing pops out. I do not wish to spend the rest of my life trying to catch a flying tooth then gluing it back in. I could use Belzona which will stick diarrhea to toilet paper but it will require a windy hammer to remove it from my skull if I need dental treatment in the future. Given that you are a bunch of old gits with yellow teeth like a burned out picket fence.... any advice?