salam
umm i hav a few friends doing dentistry and they say that it gets boring very soon and they feel like they're a plumber coz of the nature of the work.... they find it really depressing and stuff (for no particular reason)
our doctor family friends seem pretty happy.. especially the ones that own clinics coz they can work for short periods of time and get other docs to work the rest of the week.
working in hospital is hell, one of the principles of my college, his wife works in a hospital and he reckons its absolute hell coz of the overtime and the stress of it all...
personally i hate med, non the less i think its an important field and great stuff to do and many rewards if you practice it.
take care all the best
salams
ps: im expecting free service from this advise if u become a doc, lol joking