some get that...alot say it is from crashing into the glass...i had one that had a slope not as 'bad', but it never crashed...some just get it, but it will stay that way...
Genetic deformity-the shop should have given this away-probably a result of artificial breeding for food industry.
Its not impact damage the whole head is deformed.
sorry.
he could have a little trouble eating down the road just because of the severety of the bottom lip protruding past the upper jaw. should live a happy and healthy life.