Dogs are prone to developing a number of oral health problems, including bad teeth. According to the American Veterinary Dental Society, more than 80% of dogs will have some degree of dental disease by the time they reach three years old. Loose teeth and tartar buildup are the most common issues, and can lead to gum disease, tooth loss, and even infection of your pet's teeth. Pet owners should brush their dog's teeth at least once a week (more often for larger breeds) to help prevent these problems. There are also oral hygiene products available specifically for dogs, such as toothpaste and water additives. In severe cases, bad teeth may require surgery or extraction.