I agree with Joyce about not bringing a potential fault into your lines if you have health, temperament, beauty. It's time to fine tune, not risk going backwards with bites.
BNC definitely has a genetic factor to it, and we can admit that due to the fact that you state you have never produced a pup with BNC, and other breeders have ongoing challenges with it in their litters. If following autorecessive genetics, this boy has a 50% chance of carrying and 25% chance of not having the gene.
That said, huge difference IMO between a single tooth at the gumline, and both growing straight up into the soft tissue.
I would think long and hard on this one because right now your lines do not have any BNC's. There are so many mouth issues in numerous lines that we will never get cleared up because so few lines are ... more