OK, Been giving my new gsp's snails and they just eat the inside and don't touch the shell. I know that part is good for their teeth so is their anything else I can give them to help their teeth from overgrowing?
If you crush the snails shell they should just chomp through it. Check out the puffer foods article for other ideas, such as shell on shrimp, krill, crab legs...
How big are the snails, About the size of the puffers eye are ideal. I think if they are much bigger than that they can't get their mouths around them, Shell on shrimp and stuff as suggested should help with the teeth.