
I bought an adult borzoi with a broken tooth, he'd had a great puppy career then chipped an incisor, I made him up very quickly and he also won a lot of open show Best in Shows, I never mentioned it to any judge, a couple asked and I explained. The tooth certainly never held him back, I'm sure it won't for your boy either.
I also know someone whose dog was quite overshot and naturally always penalised for it, he had a horrible accident and lost all his top front teeth and has done better in the show ring since! The owner tells the judge about the accident and produces a vet letter saying he had all his teeth beforehand...lol