Mat 6:17 But you, when you fast, anoint your head, and wash your face;

"Fast" is nesteuo, which means specifically the religious practice of fasting.

"Anointing your head" is aleipho (to annoint) sou (your) kephale (head), which describes the practice of putting oil in hair to hold it in place. This was considered proper grooming at the time.

"Washing your face" is nipto (to wash) sou (your) prosopon (face), which was also considered basic grooming.