i just got back from the dentist... if you had asked me 1h ago id say that was the fuckin worst pain ever.
Real worst pain must have been falling from the 2nd floor of a barn on a sandbox, i was like 4-5 years old and i came back in the restaurant holding a piece of leg, it was at least 1cm thick and bleed like hell.
2nd one prob is when i got hit by a car (few years ago) and fell on the street, slided for about 3-5 meters. If i pushed my skin softly you could see the bone that was now a few milimeters thinner. that DID hurt (where your belly button is but on the left of your body)