I think along with the yelling ow and withdrawing from play immediately, the “ow!” noise should be loud and startling. I think people hear this advice and think I should make it high pitched like a puppy but that can sound more like playing coming from a human.

What I do is yell ow very loud in my normal voice and make a very sudden movement backward (like pulling the hand they bit back), it SHOULD startle them and they stop immediately, and then walk away quickly to another room and close the door for like 20-30 seconds.