Rinse and Repeat

Soda and Illegal Drugs Cause Similar Damage to Teeth: Acids Erode Enamel

Tooth erosion occurs when acid wears away tooth enamel, which is the glossy, protective outside layer of the tooth. Without the protection of enamel, teeth are more susceptible to developing cavities, as well as becoming sensitive, cracked, and discolored.
The General Dentistry case study compared the damage in three individuals' mouths -- an admitted user of methamphetamine, a previous longtime user of cocaine, and an excessive diet soda drinker. Each participant admitted to having poor oral hygiene and not visiting a dentist on a regular basis. Researchers found the same type and severity of damage from tooth erosion in each participant's mouth.

This is why we all need fluoride.  It rebuilds your enamel.