Clenz-a-dent® Water Additive or Mouth Rinse Solution Clenz-a-dent Water Additive or Mouth Rinse is a palatable and refreshing solution that contains RF2® which helps inhibit the growth of bacteria that leads to bad breath. Clenz-a-dent Water Additive or Mouth Rinse has a sweet mint flavor that makes it palatable to both dogs and cats.