PRESENTER:The shell of an egg is a bit like the coating on our teeth we call the enamel. The shell protects the egg just like the enamel protects our teeth. PRESENTER:I'm going to put this egg ...

If you were to take out an old filling, usually there's just a shell left. So that's a very weak substructure, so a crown is actually something that covers and protects the tooth.

They are usually three to five rounded edges that resemble a scalloped shell. Dr. Loo says that mamelons are most noticeable in children when permanent teeth first eruptand they tend to wear away ...