Why dentistry is separated from other medical disciplines such as urology & oftalmology (included in medical)?

why dentistry is separated from other medical disciplines such as urology & oftalmology (which are included in medical)? dentistry is being taught separately on its own field, why it cannot included in medical dicsiplines such as urology, otorinolaringoly, oftalmology etc? why it must be separated? for me, it is just a study of curing a small area in our mouth. so, what is its significant that separated it from other medical disciplines?

for your information, dentists attend 4 years of professional training culminating in a dental degree. dentists are experts in the treatment of head and neck because their training focuses on this area. just as you would not want a dentist doing an ultrasound on your testicles, you would not want a cardiovascular surgeon doing your root canal. specialties exist for a reason... also, medical schools teach absolutely nothing about treating oral diseases having to do with teeth. feel free to go to your proctologist for your next dental procedure if you think dentists are not worthy of your mouth.

i suppose it has to do with the more crafty/hands on/artisic/detailed clinical work involved. the first couple of years when you study both dentistry and medicine, they are similar because it's pretty much book work, theory. but eventually the clinical aspect of dentistry is a much broader and manually demanding field than urology/ophtalmology. although, educators speculate that eventually these two fields might fall under the same medical discipline instead of being separated