Medicine is still a very vast field! 5 years to have an MBBS degree adding to 2 more years for internship in order to become a General Practitioner! After that you'll have to specialize yourself into a specific branch which gonna take minimum 3 years! The job is also very tiring!
Basically you'll have loads to study! But if you can cope with all that, then Medicine is a more thrilling job with lots of challenges and helping of people to actually stay alive!
Dentistry however takes less time in terms of studying, less bulky I presume and less thrilling
Easy way to make money rapidly and less tiring
Good Luck buddy