yes to biting, but, you or they need more in the tool box. The bite is not going to end the fight most of the time, rather escalate it to an ultra violent level.
The most important part of the bite: Grappling is key, GRAB THE M-F'er for leverage which helps to damping the effects of their blows and mentality of the attacker form predator to pray!
If or when training to bite, which is the first defensive strike, multiple strikes are key. Train to eye gouge, eye rakes/pluck, soft-tissue scratching, ears tares/taking ownership of, or thumb strikes to the orbital socket are great additions while engaged in the biting process.
Rarely thought or taught of is the next step of the confrontation, Immediately upon release of Grapple partially and Bite fully, complete the action of spitting fluid or body parts at attackers face (let 'em see the follies of their ways) while quickly delivering in the same movement the headbutt strikes, larynges strikes, forearm strikes, groin strikes or combo strikes of like. Notice all strikes mentioned are plural and should be trained as such.
Follow this with your exiting strikes to the hips, knees or ankles of the attacker whither standing or downed. Redundancy is key in the training.
If you have the common sense to prep with OC and this is the first chance to use it, due to ambush,then training to spray a downed rapist/felon (AND TRAIN TO USE ALL OF IT!) is a must! Never let an adversary catch you twice.
Biting is a good tool, but its like owning a gun, without proper training, luck is the reason you make it home. Those whom are skilled seem to be very lucky.
As I am a father of girls, this seems to be necessary points of training for young woman. When they hit teens and develop the young male followers whom are in "heat", my girls will be trained to do this if attacked physically or sexually.
tex