Flower and Snake 4: White Uniform Rope Slave
A perverted dentist (and dental assistant) that likes to sleep with his patients, gets obsessed with one in particular who also happens to be a lesbian. He uses everthing he can think of to abuse this woman and her female lover. Ropes/Dental tools/Ice Buckets/Candles/ (the works) and sometimes he sets the mood with something from his classical music record collection.
Directors: Shôgorô Nishimura
Writers: Oniroku Dan
Homepage: https://www.nikkatsu.com/movie/26375.html
IMDB: tt0285593