jello and applesauce is the best thing I found when Ive had dental procedures. I have never had a root canal but I had to have one pulled and the root was twisted and the dentist could not get it out. He pulled and pulled and it broke and he thought he was going to have to cut it out. It did finally come out but it caused ALOT of swelling and bruising. My whole right side of my face was bruised for like three or four weeks!!