The cover has it right: there is no apostrophe in "Gets", but the interior of the book has the apostrophe throughout. That, coupled with the fact that sharks effectively have their teeth on a conveyor belt and routinely replace old ones which fall out, with brand new ones rolling to the fore, never would actually need a dentist, and the wrong number used when referring to "candy" as "them" on one page meant that this story started out badly in my view. It wasn't a disaster, but I just felt it could have been better written and offered a lot more than it did, and as such I can't recommend it.
Obviously you can’t lecture young kids or go into great detail about tooth decay and so on, but I think there are less simplistic ways you can tell a story like this which will resonate with young children and make a better case. The human body craves fat and sugar from a period in our distant past when such things were hard to come by. Now they're in everything and it’s much harder to direct your kids away from harm while still trying to let them feel that they're not pariahs amongst peers who get treats and drink sodas and so on.
As someone with a sweet-tooth bequeathed to him by rather irresponsible parents, I've fought this all my life, and I would have liked to have seen a more educational and better-nuanced story. I’d like to have seen the point made that copying what everyone else does isn’t necessarily smart, and that while too much candy is definitely harmful, a little bit here and there as a treat or a reward, alongside regular dental visits and routine dental hygiene is not the embodiment of evil!
The story was colorful and definitely made the point that brushing teeth is important, but I think it could have been much improved. That said, this is part of a series, and there are other stories in it which might tell a better tale on thier respective topics.