After 6 years on Nutro (before i switched to a combination with raw meat) I took my 11 year old cat to the vet for a tooth cleaning. My vet looked long and hard at her mouth and said "if she was my cat, i wouldn't clean her teeth!" so i didn't. I have noticed a marked improvement in dental health of all of my cats (note to self, check teeth tonight) - i have to blame it on what they're eating. THey get nutro, friskies dental diet (Treats only) and the chicken..