What does pop do to your teeth?

Staining.: Can stain your teeth, weaken enamel, and cause erosion.

Cavities and more: Soda pop contains corrosive acids such as citric, malic, tartaric carbonic or phosphoric which, can remove calcium from tooth enamel. Without protection from the dental enamel, the tissue underneath is susceptible to cavities, root canals & even extractions. Sugar is an additional cavity causing issue, so consider rinsing your mouth after drinking soda, both diet & soda containing sugar.

Coke and Teeth: It is easy to find out the answer to your question. Go buy some coke and place a chicken bone inside it for a week. After a week take out the chicken bone from the coke and see how it feels. The bone will be very flexible. When teeth are excessively expose to carbonated drinks, it can erode the enamel surface of teeth opening the door to decay.

Doubly harmful: If by "pop" you are referring to carbonated beverages there is potentially doubly the risk. This is especially the case if you are drinking a sugary carbonated beverage. The sugar promotes tooth decay by demineralizing the enamel when metabolized by cariogenic (decay producing) bacteria in the mouth. The carbonation of the beverage can also cause demineralization of the enamel.