It really depends on who you RP with has been my experience. A few people that I had short interactions with were just sadists. All they wanted was someone to drill their teeth without anesthetic in older dental office settings. I think it had a lot to do with the style of dentistry from the 50's & 60's, especially in Europe.
There was one particular chat partner I had though that was looking for as close a thing as going to the dentist as possible. That was a marvelous RP that went on for a little over month. We met once a week for a few hours for each appointment. During her first appointment we took X-Rays, did a full intra-oral exam, examined her existing restorations and checked for new cavities, did a full periodontal assessment and made a treatment plan. Her scenario was that she hadn't been to the dentist in a few years and had 8 composite fillings already in her 1st and 2nd molars. Teeth were regularly brushed (2 to 3 times a day) but not regularly flossed. She was interested in some bonding to fix a chipped lower anterior and wanted to replace the composite fillings with amalgams because she was concerned about their longevity and durability. For a treatment plan we decided that she should undergo Scaling and Root Planing done across two appointments, have the bonding done in one short appointment and then remove 2 fillings at a time across 4 appointments.
I created characters in the office for her to interact with to make it as immersive as possible. Charlie was my receptionist. He was in his 50's and was a soft spoken gentlemen who had given up on teaching because he was fed up with how the local government interfered with the school system. He took a medical billing course online and interviewed for a job in my office. His intelligence and his grace made him a perfect candidate for the job. There was also Rosa, my hygienist. She was Brazillian and in her early 30's. She was short and petit with incredibly long hair. She emigrated to America when she was 14 with her family. Her father was an investment banker and got an opportunity to work with a prestigious Wall Street firm who handled all their immigration paperwork. She had to learn English as a second language late in life so she had a very heavy accent and didn't always have the right words. It made giving oral hygiene instructions very interesting. Lastly there was my assistant Jen. She was in her 40's and a mother of 2. She only worked part time and I would only schedule my appointments around her availability because she was a damn good assistant. She had a fiery personality full of passion and loved to gab.
Depending on what we were doing for each appointment I'd send videos or sound clips during the procedure. Things like an ultrasonic scaler, suction or a drill running to help enhance the experience. I tried to keep things as realistic as possible. Usually the day before an appointment I'd google the procedure we were doing and try and find resources on sites for dental students as though had the most thorough and technical discussions. That knowledge helped me better write the actions of my staff and myself. I did quite a bit of research on the different types of injections and techniques when she needed to be numbed so I could describe exactly where I was inserting the syringe and why I was putting it there.
All in all we met for about 7 weeks to address all of her needs. When we were done she had 8 amalgam fillings in her molars, clean teeth, healthier gums and some nice cosmetic bonding on her lower anteriors, She never did request another appointment and I haven't had a good chat partner like that in a while.