OraVet Dental Hygiene Chews combat bacterial attachment, the starting point of plaque, calculus and halitosis. Each chew releases delmopinol HIC, an ingredient that coats the teeth, tongue and gingiva to create a protective barrier against the bacteria that cause bad breath and are the basis for plaque. OraVet Dental Hygiene Chews also break down existing plaque and then effectively remove plaque and calculus through mechanical action. OraVet Dental Hygiene Chew should be given as directed by your veterinarian as part of your dog's complete preventive oral health care regimen. Always monitor your dog until the chew is fully consumed. Chews are intended for dogs six months of age and older. OraVet contains ingredients that include Chloraphyl, parsley flakes and alfalfa that may cause changes to you dogs stools.