Greenies are a great way to improve your dogs dental hygiene up to 80 of all dogs over 3 years suffer with plaque and tartar which happens when food gets caught between the teeth plaque and tartar can cause bad breath gum infection and even lead to tooth loss and you will need to take your dog to the vet to get your pets teeth cleaned properly greenies dental chews are a great way to help keep your dogs teeth clean and also to prevent plaque and tartar build up these treats will help to