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In an article in Prevention Magazine, a comparison is made that diet soda is as corrosive to teeth as methamphetamines.
Acid is a major cause of dental erosion, and citric acid is a component of diet sodas. If you drink more than four twelve ounce cans of diet soda a week, you enter a zone of high risk for dental erosion. Our national average is 11-12 cans per week.