The Dentist from the Black Lagoon by Mike Thaler
I had to take Amber to the dentist one day last month and The Dentist from the Black Lagoon was sitting on the table in the waiting room. I picked it up and read it of course, because it's a book and it was sitting there. It's the tried and true Black Lagoon formula. The dentist is coming to school and of course Hubie imagines all sort of horrors, but it all turns out good in the end.
All the dental words - caps, crowns, bridges, etc. - make for some amusing illustrations that are fun, colorful and busy. This is not one I would go out and buy, even if I did have a kid the appropriate age, but I would pick it up from the library, especially if I had a child who was leery about going to the dentist....