Why Are my Two Front Teeth Still Different Sizes After Filing to Correct This Issue? (photo)

I would first ask " What are you trying to achieve?" Are you trying to get a cosmetic look?? Are you trying to have the teeth function equally?" It looks to me the the 3rd photo is reversed.  Another question I would is how many rulers are you eating?? (Joke) It is also very hard to make a diagnosis with out seeing what your lower teeth are doing. Your tooth position can often be determined by where your lower teeth are located. Are you a tooth grinder (bruxer). I would have a conversation with the dentist, and ask for options, and make the best decision given all of you choices and what you are trying to achieve.

It appears that there is a breakdown in communication between you and your dentist. On a photo that is digitally analyzed and referenced to your facial midline (vertical) and occlusal plane (horizontal), you and the dentist should come to an agreement on the lengths desired.

This is tricky in the first 2 pics it looks fine visually and the fact the tooth to the right the edges where they meet are different and the gum line issue but the ruler test is not a good indicator unless u also have a level on it because you wont know what straight really is if you pulled gently on the ruler up on to the left they would both touch head tilts and other muscular issues can throw your eye off and change your perception

Good Luck

Dr. G