Just got my teeth whitened at the dentist office with some type of hydrogen oxidious crap and some lasers that shot my teeth for an hour. It's about as pleasant as that sounds. In fact it was so pleasurable, I think i will go shoot myself now.
It's not painful, but there's this throbbing sensation, (no.. not pleasurable) and some tingling irritation. I can't quite describe it. Just imagine stepping on hot coal and then taking your foot off and doing a faceplant. That's about right.