I've been very devastated since I had a root canal retreatment on tooth 35 in July, 2019. My first root canal was done 5 years ago and it had been fine. My new dentist found a dark spot on that root in x-ray so he did retreatment. He drilled the old crown, did the job and sealed the hole. It was okay. But when I came home, the hole wasn't fully sealed so I went back a week later. The nightmare began from then. He not only filled up the hole but trimmed down too low and I had a low filling. To compensate, my tooth 45 felt bigger, sore and gum got weaken. I went back to fix the filling, he refused saying it's because my clenching so I need a night guard. (I went to see a different doctor later and he said I don'clench). I tried to get by, but now it's almost three months past and my chewing and speaking felt different. First time, I doubted about TMJ but I didn't have any pain or symptoms.... I searched more, now I am wondering if my jaw muscles have changed to adapt the new occlusion. It's definatley different since it all happened. The new doctor said one tooth doesn't make those changes but I can feel them... I suggested a new crown but he turned down... I really don't know how to fix it...is it just my damaged old crown or changed jaw muscle to affect my alignment?