When my baby teeths and starts to bite on my wife nipples, it creates a situation of soreness and pain. what are the possible solutions to address my baby's need to bite things?

Buy teethers for normal day and normal time biting. For biting during latching, The mother have to teach. Like if bite have to unlatch and warn/scold him, and then latch and if again then stop latching. So that baby will associate biting = no latching