Heal A Pet Oral Gel (4 oz.) Antiseptic Oral Cleansing Gel contains Atabilized Chlorine Dioxide, a proven bacteriostatic and deodorizing agent that destroys volatile sulphur compounds that build up in your pet's mouth and are a major cause of bad breath. Formulated with a pleasant, slightly sweet taste, regular use of HEAL-A-PET Oral Gel will help provide clean fresh breath for hours. Directions: Heal-A-Pet Oral Gel may be applied directly to teeth and gums from the bottle applicator tip with your finger or with the aid of a swab. Apply daily. Active Ingredients: Sodium chlorite (0.1% as available chlorine dioxide).