When I took Brady to the vet this week, she mentioned that he could use a teeth cleaning (but didn't do it) and picked off a couple of chunks of tartar that were on his molars. He is an ex-feral who tolerates being cuddled for about 20 seconds and I don't feel comfortable trying to brush his teeth or even hold his mouth open to get a look. Is there something I can give him to help clean his teeth naturally? I know with dogs giving them raw bones makes a huge difference in their dental hygiene but that doesn't seem like an option for kitties.