You can add various additives to your pet's drinking water and that can reduce the tartar formation. (animalbehaviorcollege.com)
No doubt, more studies are needed to make some firm conclusions, but for now, just remember that you should stick with unprocessed foods which don't have various additives in them. (fitnessandpower.com)
Let me explain... «Natural flavors» can even mean various additives, even forms of MSG and artificial sweeteners. (nourishfamilynutrition.com)