Drinks That Eat Teeth
Demineralization, or loss of tooth material, begins at a pH of 5.5.
Missing data is unknown at this time.
Because the pH scale is logarithmic, a one unit change in pH is associated with a 10 fold change in the acidity. For example, lemon juice has a pH of 2.0, while grapefruit juice has a pH of 3.0. Lemon juice would therefore be 10x as acidic as grapefruit juice. Even more enlightening, Coke Classic is roughly 100 times as acidic as Barq's root beer.
NSDA
Missouri Dental Association's Stop The Pop
There is some useful information on acid erosion of teeth on both Dr. Richard Ehrlich's site and on Dr. Steve Hendry's site.