If you are drinking soda on a regular basis, you may not be drinking enough milk and could have a calcium deficiency, which slows bone growth. Poured directly on a bone, acidic liquids can dissolve certain minerals in the bones. Note that acerbic acid, an ingredient in many sodas and soft drink mixes, is an acid that can have this effect. Nothing should happen to your bones so long as the soda never touches them directly. You teeth, on the other hand would fall off if they were not as strong as they are, with enamel and such.