Lighthearted:
* Getting a tooth pulled is like trying to remove a stubborn sticker from a window – it just doesn't want to come off!
* Getting a tooth pulled is like a tiny earthquake happening in your mouth.
* It's like trying to pry open a clam with a spoon – you know it's going to hurt, but you have to do it.
More Intense:
* Getting a tooth pulled is like having a tiny, but powerful, beast gnawing on your jaw.
* It's like someone trying to remove a nail with a pair of pliers – it's forceful and uncomfortable.
* Getting a tooth pulled is like having someone dig around in your roots with a small shovel – it's jarring and unsettling.
Humorous:
* Getting a tooth pulled is like having your worst nightmare come true, but in your mouth.
* It's like getting a free massage, but from a very insistent, pointy finger.
The best simile will depend on the specific experience and the tone you want to convey.