There are 3 paths for a dentist to get an MD
1) complete an OMFS residency (6 years)
2) get advanced standing and take last 2 years of med school
3) start med school from scratch
those are the ONLY 3 routes. There is no such thing as a program which gives dentists MDs without having to do more training (at LEAST 2 years, via med school, or 6 years w/o med school)