I went from dental to medical. I technically sold "medical devices" to dentists. The experience helped me get interviews with real medical device companies but I it didn't help me much once I was hired.
Sales is sales but selling to a hospital and to a dental office are two totally different things. Dental is a lot easier to get penetration. You have cranky receptionists to get past and that's about it. Most dentists make their own decisions so it is not a multi-level sale. You are asking them to spend their own money (and not hospital money) so that can be difficult. Some of them have very little business sense and because of that they often make poor/unpredictable decisions.
I work mostly in the OR and it can be an extremely complex sale. You have to sell nurses, docs, purchasing agents, C-Levels, materials managers, SPD managers........and the list goes on and on. You have to be a lot more strategic. In dental it was ok if I pissed off an office manager by being too persistent to get an appointment because there were 1000 other offices in my territory. But now with medical I only have about 50 hospitals. There is no room for error with only 50 accounts.
If I could do it over again, I would have held out for a medical job and skipped going into dental all together.
The pay is similar between medical and dental. If your end goal is medical, my recommendation is to start with medical and get your feet wet in an entry level position that will actually help you in your future endeavors.