I officially own the most unlucky tooth ever. I've been dealing with this tooth for over 7 years. Here's the story: Crown #1 - Tooth becomes sensitive to cold. Dentist #1 decides it needs a root canal. Does the root canal, and then puts a crown on. The crown is huge, and starts really irritating the inside of my mouth. I have Dentist #2 look at it, and he says that the crown is poorly made, poorly installed, and should be changed. Dentist #1 agrees to redo it. Crown #2 - Dentist #1 installs crown. When I complain that it's a bit large again, he grinds the back off, leaving it rough. I go back to Dentist #1, who looks at the crown, and sees that Dentist #1 left a large "margin" between the tooth and the crown. I tell Dentist #1 that I am not paying for the crown, and want the insurance refunded, so I can get it replaced. Crown #3 (the best so far) - Dentist #2 puts in new crown. It feels good, nice size and lasts a couple years. Crown #4 - Dentist #3 (Dentist #2 went off my insurance) notices a pocket of infection in the root canal of the tooth. After a few more xrays, determines that the root canal was done wrong, and needs to be redone. Removes crown #3, opens the canal, and infection puss sprays out of the tooth (so much so that he calls his hygenists in to look at it). The infection has eaten through the root of the tooth, opening it into the sinus cavity. We spend two weeks trying to kill the infection in the tooth, then he puts some stuff in it to reseal the root. Finally, after 3 months, we put on a new crown, and hope it's over. Crown #5- 9 months later, during a business trip, I notice a bit of the crown comes off while eating a Dorito. Later the next day, the crown breaks in half. Dentist #3 calls the dental supply company, and they agree to no-charge replace the crown. He installs new "unbreakable" crown, but the next day, it pops off. He re-cements it. Three days later, it pops off again while I eating, and I bite it in two. So, now, I'm getting ready to go in tomorrow to get a new temporary that will hopefully last while I'm in Moscow, and then come back for crown #6. This is truly the tooth from hell. The other day my boss told me, "You have a lot of problems with your teeth, don't you?". I said, "No, my other teeth are fine. It's just been this one tooth!"