It is a #3 molar. The endontist used Gutta Percha in the roots, and I specifically asked if any mercury was used and they said no. Her pain is now subsiding and she is almost off of any pain killer (ibuprofen). I don't think she is going to change her mind about keeping the tooth but for our sakes I hope that we have some better luck. The endontist said he put her at a 90%+ chance of having a successful root canal. I should have asked what that really meant. His secretary said she had her root canal done 20 somewhat years ago and she is doing fine.