i imagine the first time DS went to the dentist, he was in his Mimic form (basically Lian but with hair covering his face) and his dentist told him to open up and immediately regretted it
like bro he would not be able to see but be able to see his vision would keep going out and I imagine that he would also get a bunch of food on him since he can barely see it and when he's chewing he sometimes gets some food on his eye since his eye is in his mouth and he has to wash his eye out periodically.