The very first thing is to go to a dentist. If your teeth are aching, something is wrong. Potentially, it's a cavity. So you need to get checked out first and foremost.
Alongside it, normal spiritual healing procedures apply. These practices support dental treatment from a dentist. They do not replace it. So please go get your tooth checked asap!
It's better to take care of dental problems now than later on when even more serious situations appear.