Herbie goes to have his teeth cleaned next week - he may lose a few more teeth. When he's happy, his teeth chatter, and it saddens me to think that I may not hear that sound again, but it is so beyond time that his teeth were cleaned... Some greyhounds have difficult teeth, and Herbie has needed his teeth cleaning every 9-10 months, even with daily toothbrushing. Holly, on the other hand, has been with me for four years now and not needed one dental. Similar diet, better teeth.