Tartar and plaque on the teeth is a sign of a lack of HCL. You can take Betaine (Sugar Beets) HCL (Hydrochloric Acid) and this should take care of the problem. HCL will assist in digestion. Without it or a lack of it, improper digestion takes place leaving your body without the proper minerals/nutrients it needs. HCL should be taken with pepsin, an activator to HCL.