Dental School debt terrifies me

I am planning on being a dentist in the military, and I heard the Army is the best. I don't want to worry about debt. So how can I get dental school paid off through the Army? I heard about the hpsp but its highly competitive. are there any other routes? Gi bill? something else?

(I am also planning on going into the ROTC in college as well, so might that affect anything?) thank you !