"BreathaLyser Drinking Water Additive for Dogs Freshes breath, reduces tartar, no brushing Safe, alcohol-free, drinking water additive Reduces, not just masks bad breath Reduces tartar with daily use Improved owner compliance: - simply add two capfuls to one quart of fresh drinking water per day (10mL per litre) No brushing required. Now available in a 6-PACK size for added convenience and savings! Ingredients: Purified water, Glyercine, Hydroxymethyl-cellulose gum, Potassium sorbate, Sodium benzoate, Barley malt extract, D&C Blue No. 1 & Chlorhexidine digluconate 0.049% w/w as a preservative."