I had a root canal recently done.. I kept telling them I feel a nerve left. They assured it was complete. Mind you , I had to do a retreat by a specialist because of one dentist messing up. Showing the e-rays to my GF ( a hygienist ) , she said 1: the canal wasn't completely cleared on one side (circled) and that she believes there is a spilt/crack ( also circled) and that a crown should of never been placed if that's the case.. Any 2nd opinion?