Looking at Robert’s final result, I have to agree with him. Even smiling as big as he can, no one can see the gum-line area of his crowns. In this case the tissue did not need to be changed to have an excellent final result. If his lip rose above the tissue/crown meeting area at the gum-line, these crowns would not have been as pleasing to look at. Here he is at ‘maximum’ smile:
