I don't know about the situation in Hong Kong where you are, but here in the United States, dental school isn't any easier than medical school... At least not at the school I'm in. Why? Because we take many the same courses as the med students do!
During my freshman and sophomore years, we take courses with the med students such as gross anatomy, histology, biochem, path, micro, etc. And at the same time we have to master many of the techniques too for the core dental disciplines like operative, fixed and removable prosthodontics, perio, etc.
Definitely more than meets the eye.