what are the beye and bmou fsh files for?

they look like an eye and teeth thing to me..
is it important when making your own cyberface?

i made a cyberface for a player i created and i just used tmac's headshape, it looks good but when he opens his mouth sometimes, the lips and teeth kinda misalign

are the beye and bmou fshs used to correct that?

yup those are mouth and eye files and not necessary to edit when making cyberfaces.