genuine question (sorry if it sounds stupid),

but why are there dental clinics/doctor examination cubicles or whatnot inside campus? does the school give check ups to students who come in sick and need to go to the clinic? i never really learned about what the HSO does cos it was never taught to us lol. i cant find info din online. the only interactions i've had with the clinic/hso was that one time i requested for medicine. they seem pretty strict about who comes in their clinic din e, why is that so?

i always see people waiting around the chairs by the clinic, i've always been curious if for what ung pila nila doon. can someone please enlighten me? thank you!