The chief of pediatric dentistry where I work complains about this all the time. According to him, the sugar/acid combo found only in Hillbilly Piss Mt Dew is excellent at eroding all enamel from your teeth.
My dentist (who happens to be my father), told me that I have the enamel of an 80 year old. That’s what 2-4 liters per day of diet soda does. Soda Mouth strikes again.