If it is a medical concern, like you are truly suffering from pain or something similar, then you would be treated and they would go form there. It is possible but it would have to be horrendous.
I can promise you this though. If your teeth are bad because you aren't brushing them at least once a day, you -will- be called out infront of your company and made an example out of. Or in a worse case scenario, your fellow trainees will find your teeth so disgusting, they will hold you down and brush them for you.
We had a guy like that in PLDC at Ft. Benning and we held him down and brushed the brown and black plaque off of his teeth. The buildup was so bad he bled for awhile when the plaque was brushed off. From that day on, he brushed every morning and night until we graduated.
BRUSH YOUR TEETH.