There are a couple of products that may help keep teeth clean Plaque Off can just be sprinkled in food ProDen Plaque Off: Natural Dental Care Product - £7.29 and Logic Gel Logic Oral Hygiene Gel: Enzymatic Dog & Cat Toothpaste 70g - £4.50

As Katysu mentioned, diet is another good way to keep teeth clean - raw chicken wings will help prevent plaque build up. Unfortunately dry food doesnt really help, contrary to what we have been led to believe! It can actually contribute to dental problems.