Hi Knackers, Things can hurt without damaging the teeth. This quick effect can be prevented with Sensidyne toothpaste that blocks the tubules that are under the level of the enamel. Perhaps it does damage but erosion and decay are not painful until they are deep. This happens in minutes to hours to lots of people for lots of reasons. That is why there are toothpastes for people with this happening. This is what my dentist told me. Also the nerves become more sensitive within hours as the nerves wake up with MeCbl. I'd be dead years ago if I had let some tooth pain stop me.