It's funny you mention this because I just scheduled an appointment for Diamond to have her teeth cleaned and was going to ask the same questions
She is 2 but has never had a professional teeth cleaning and the groomer recently brushed her teeth for me and said her back teeth look really bad and could fall out. I looked at them and basically her back teeth have a lot of plaque and tartar buildup but her front teeth are A-okay.
The vet told me if they look at her teeth and don't think they need to be cleaned, they will call but I have a feeling they will need to clean at least the back teeth. I just hope she is okay