Thank you for your reply- I feel a little better. Star's always had such nice white teeth, and has never been a chewer, but we think she must have damaged her teeth years ago when our neighbors had a walnut tree and she seemed to love eating the walnuts. She doesn't seem to be having any big problems, he's just concerned at the amount of tarter built up on the broken one, that it could really make her sick if it gets infected. If we're going to put her under, we may as well do it all.