dentistry is not just teeth. its the whole mouth. the whole mouth can have certain conditions due to all sorts of systemic conditions like HIV, diabetes, even stomach problems.
if we were good at your job and you had a severe childhood disease we may be able to tell you when it happened simply by looking at your teeth if they were affected.
psychological disorders such as bulimia and anorexia can often be spotted first by the dentist just by having a look at the teeth.
when we graduate we are known as surgeons because we have done surgery in the mouth and would do it on a regular basis in our working life. the uni needs to make sure that we are competent at it before we graduate, and as everyone knows, surgery is no mean feat.
dentistry has many different branches-prosthetics (fixed eg crowns and removable eg dentures) and it doesnt take long to have it taught to us, but it does take a while to become competent at is. the same applies to general restorative work such as fillings and root canal treatment. there is a separate module based solely on the treatment of children for obvious reasons. oral surgery, radiology and orthodontics also can be taught quickly but needs practice at.
we could quite easily make it a 3year course, forget treating patients in uni and go straight into practice without having treating a patient, would you like that????
would you like it if we told you that you had an some sort of ulcer or rash of some sort in your mouth and not tell you why it may be there and refer you to a gp for a checkup???
i very much doubt it.
if a course is 5yrs long then there is a reason for it. dentistry is no doss course and is probably more intense within the 5yrs than medicine itself.
sorry for the rant but we are probably the only people in uni right now which is why i get a bit short fused when someone says "why is it so long" when the answer quite simply is-because there is a damn lot to learn and practice.