Sentry Petrodex Veterinary Strength Dental Spray for Dogs and Cats (4 oz Dental Spray) Sentry Petrodex Veterinary Strength Dental Spray helps freshen breath in cats and dogs. Petrodex Dental Spray helps clean the teeth and gums. Spray formula provides a convenient way to reduce plaque and tartar. Apply daily. Safe to swallow. Contains 0.12% chlorhexidine gluconate.