Although im sure all of these work in some capacity, has anyone here tried simply applying suction to the tooth (specifically the hole) using the tongue and cheek? Your looking to feel a tingling/nails on a chalkboard feeling to be sure your doing it right. Believe it or not the worse the cavity is, the better this method works. Sometimes it takes a while playing angles and pressure, but youll know when it works because of instant lasting relief. And if your very lucky, it will not hurt at all, then suddenly hurt alot, then it numb (with maybe a little drainage). In this case you are golden, it will be gone for a long time/forever.
Try it :) and youll be laughing at all this other craziness with me.