At the university I attended we do study medicine first... well the first 2
years of it anyway.  We take the didactic learning with the medicine
students prior to their rotations.

So... again where I am from it rolls out like this:

- 2 to 4 years of pre-dentistry 'science years'.  I was dumb* and I took 4
years.
- 4 years 'year-round' (including summer months) of dentistry which include
2 years of medicine with dentistry in the summer and the last 2 years are
all dentistry including the summer.

Oral surgeon is an interesting title.  Alot of dentists used to call
themselves that but my local governing body (ADA&C) are not fond of that
title anymore.  Although our degree is "Doctor of Dental Surgery" we are
asked to stick with 'dentist', 'doctor', or 'Dr.'  This is an Albertan-thing
though.  You will find all sorts of rules elsewhere.  Even in Alberta not
everyone follows the rule.

Oral and maxillo-facial surgeons take 4 to 5 years additional training after
dental school depending on where they take the program.

jwn dds

We do not but we think we do.

In the USA, you become a dentist if you really want to be a physician
but you're not quite smart enough for that.

The oral surgeons and dentists in the USA both have "DDS" degrees, but
the differences between them are vast.  Dentists just fill cavities and
fabric fake teeth.  Oral surgeons actually operate on people.

(And if you ever call an oral surgeon a "dentist" you'll get a dirty
look.  It's kind of amusing, until you realize that you just offended
somebody who is about to put you to sleep and use knives, chisels, etc,
in your mouth.)