There are 4 year programs as well as 6 year programs ( almost half are 6 year programs now).
You complete medial school while a resident, in a 6 year program. So, dental school plus residency will be 8-10 years. I think ENT is 4 years med school, 1 year internship ( required after med school but not after dental school) and then 4 years residency. I hope this helps.