Afaik, the MDF they manufacture today doesn't use formaldahyde like the older stuff of 6-7+ yrs ago but check with your supplier on that. Regardless, you don't want to breathe the dust or get it in your eyes, it's pretty awfull. You'll need a quality hepa style filter on your vac to clean up the dust afterward.

Half of communication is listening. You can't listen with your mouth.