When toothpaste containing the soluble tetra sodium/ potassium pyrophosphate is applied to the teeth and gums, a chemical bonding process occurs. Pyrophosphates (crystal growth inhibitor) act as chelating agent and removes calcium from the saliva to form a soluble complex that can be rinsed away with water thereby controlling new calculus buildup. Any calcium phosphate that has not yet bonded to teeth is attracted to the sodium pyrophosphate. When the new compound mixes with water, it is completely dissolved. The toothpaste cannot dissolve the tartar that has already bonded with the enamel, but it can stop future deposits from forming. Fluoride also inhibits the metabolism of acid-producing bacteria thereby indirectly help in tartar control in addition to controlling cavities.