the wikipedia cut and paste is hilarious...congrats, you are in high cotton.
while you are correct that poor grammar and poor English cannot keep you out of dental school, it sure will not make your life any easier. past mere studying, you will have a giant vocabulary of unfamiliar terms come your way, patients to communicate with, clinic notes to write (so other providers know what you've done, so not in your own shorthand), scripts and lab orders to write...if you can't communicate clearly with your lab, your job becomes much more difficult...
aside from school, the military runs on English, but from looking at our manning situation, im sure you can find a scholarship and an active duty billet to fill.