Hi Ada, Not saying don't be concerned with a possibility of ulcers but I have a 2yr old who loves to naw on my lace curtains. It makes a horrible "nails on chalkboard" type sound but he loves it. He does not chew pieces off but almost uses it like a teething ring. He has no mouth issues. No ulcers. But he loves to bite down hard. He also loves hunting mice. But not much for other raw diet options. Even when playing he will grab the towel we play with and bite and naw as hard as he can on it. Hence why we use a towel. Now my boy never gets pieces off and does not chew any of his bedding but thought I would share my experience. Thanks Kathy https://sites.google.com/site/sammysclubhouse [Posted in FML 7486]