If he is actually biting you (as opposed to the teeth feeling uncomfy in themselves iyswim) then you can try:
pushing him on when he does it so he has to stop and pull off to breathe
saying no and removing him
giving him a teether- perhaps one with gel/water inside from the fridge to cool his gums before feeding
I'm sure people with babies with lots of teeth can help if its that- s still only has a couple!