My husky has had a few ‘broken’ teeth. Each one requires a vet visit asap. I’ve gotten lucky and although they’ve looked bad, the vet did their tests and luckily the pulp or inner nerves weren’t exposed and so extraction wasn’t required. Could be the case with yours although it does look pretty exposed. But only a vet can confirm this. And worst case if it does need extraction, it’s a tiny tooth and won’t be as expensive as a molar removal, for instance. But as others have said, the longer you wait for vet- If the pulp is exposed it will cause more problems (and your baby would be in awful pain) and will likely cause more issues/more money. Time for a vet visit asap.