Healthymouth water additive provides a simple solution - just add one teaspoon or 5ml in 1 liter (or quart) of your pet’s drinking water daily to proactively prevent poor dental hygiene before it starts. Even more concerning, 80% of dogs and 70% of cats have signs of oral disease by age three! Healthymouth TM has 46 dental care products and ALL 46 have been awarded the prestigious VOHC Seal of Acceptance for plaque control in dogs and cats. Healthymouth TM is the FIRST and ONLY dental water additive and topical gel awarded the seal 2. I hope this helps! Received message. Healthymouth water additive provides a simple solution - just add one teaspoon or 5ml in 1 liter (or quart) of your pet's drinking water daily to proactively prevent poor dental hygiene before it starts. Even more concerning, 80% of dogs and 70% of cats have signs of oral disease by age three! Healthymouth TM has 46 dental care products and ALL 46 have been awarded the prestigious VOHC Seal of Acceptance for plaque control in dogs and cats. Healthymouth TM is the FIRST and ONLY dental water additive and topical gel awarded the seal