Cavity damage isn't uniform though. It depends on location of exposure and the way the mouth salivates. It makes sense that the cavities are toward the back of

Cavity damage isn't uniform though. It depends on location of exposure and the way the mouth salivates. It makes sense that the cavities are toward the back of the tongue. Anyhow, I would be careful. Just get a potassium chloride rock and throw it in the water. No biggie.