Grooming training

Im after a training tips to teach a bitey pup to tand still while i groom them millie is uch a glut! she will do anything for a gravey buiscit she is till after the one i put in her ball she hasnt quite figured out how to squeeze inorder to release it but she is a smart pup she will figure out what she is meant to do.

unfortunatelty I cant seem to groom her without her bitting my arm pretty hard quite worrying if i ever wanted to take her to a groomer asi wouldnt want her chomping on a groomers arm the way she does mine!