The bolded jumped out at me. Just curious, are your parents pretty elderly? Do they like the dentist going over their dental issues with you at your appointment? I am guessing that both they and you like that arrangement? You don't have to answer, I was just curious, as something similar caused a big issue for me.
My Mom and I had the same PCP for years. Although, I really liked her and thought that she was an EXCELLENT Dr., I finally had to find a new Dr. and leave the practice. Everytime I went to the Dr. she would spend part of my appt. talking about my Mom. (My Mom was 64-69 during this, so certainly young enough to care for herself) I was super uncomfortable and didnt feel she had any right to be discussing my Moms health with me at my own medical appt. In turn the Dr. would also talk about me to my Mom!! UGH!!