How to stop baby (with teeth) from biting during latching???

I will pinch my son nose, and tell him firmly NO BITE BITE! Must be fierce, dun let him think you joking, after that he seldom bite anymore. Just be careful as he grow older, dun offer him if he don't want to drink or got distracted, the tendency of letting him bite is higher unnecessary instead. Now he do understand no bite bite and drink milk milk difference.