Why do I need to clean my pet's teeth?

As in humans, plaque bacteria constantly forms in the mouth and can accumulate on teeth, gums and the tongue resulting in bad breath, gum disease (bleeding gums), tartar and tooth decay. If it is left untreated this can lead to pain and unnecessary or premature tooth loss. Bad breath is usually the first sign of the problem.
Unhealthy teeth and gums in a dog	Healthy teeth and gums in a dog