Part if not all of it will fall out anyway. Why not make life simple and shave now. That way the mask fits better and it will be less traumatic when the radiation effects set in.
During radiation I would do a little as you can get away with, shave or trim if you can/need .... that was the least of my worries
M

Partial glossectomy (25%) anterior tongue. 4/6/07/. IMRT start @5/24/07 (3x) Erbitux start/end@ 5/24/07. IMRT wider field (30x) start 6/5/07. Weekly cisplatin (2x30mg/m2), then weekly carbo- (5x180mg/m2). End of Tx 19 July 07.