Over 80% of dogs and 70% of cats over 3 years old have some form of periodontal (dental) disease. Dental disease causes bad breath (halitosis) and pain, it is also a source of infection and can make your pet seriously ill - See more at: http://www.vetwest.com.au/pet-library/about-dental-care-and-brushing-your-pets-teeth#sthash.mDrfhMWE.dpuf