M.P.
Try a teething necklace. It's made of Baltic Amber which has a natural pain reliever. My son teethes 2-4 teeth at a time (JOY) so his pain is intense. When the necklace isn't enough, I give him teething tablets. Works like a charm.
BUT I do know that it is fine to give my son some Tylenol or ibuprofen while he is fine. In fact he's on some right now since we are at my school working. I didn't want to take chance on him being grumpy.
Give your son the amount you think he needs in a day. It will make your lives better with less of the grumpy baby :D
**I actually have a braclet that I put on my sons ankle so that I don't have to worry at all about him playing with it or strangulation :D