I have no idea on the price of full root canals but if it's not a front tooth then i would get it pulled. I had a bad tooth when i was about 11 and most of the tooth was rotton right down to the nerve. Got it filled but all that was left of actual tooth was the ourside of it. Was told it would prob need to be pulled later on. 5 years later i started to have excrutiating pain(100 times worse than birth) so went to the dentist 5 times in one week and got a first stage root canal but in the end just begged for them to pull it out. It was a back one and now, 3 years later, the gap is almost gone and my top teeth are actually not as bunched up now. Anyway, for the 5 trips tot he dentist and 1st stage root canal it cost over $1500..