My teeth are really bad can i get partial upper and lower then join military?

hey im 18, yes i know thats very young i smile is very bad, as i have bad genetics and the importance of brushing my teeth was never imparted on me. i get really self concious while talking and i NEVER smile with my teeth unless im alone, so i was wondering if partial dentures were a good idea? i would like to get a degree in welding and then join a branch of the military.