Solubility of Enamel on Areas of Known Hardness

Abstract
The hardness and solubility on identical areas of ground surfaces of enamel on a large number of teeth were measured. The enamel varied widely in hardness and solubility from tooth to tooth as well as from area to area on the same tooth. No . correlation between hardness and solubility was detected. The Ca/P ratio of the enamel dissolved out during the solubility tests was slightly higher than the 2:1 known to exist in enamel.