Ready, Freddy! Tooth Trouble by Abby Klein, illustrated by John McKinley

From chapters.ca:
Meet the new kid on the block! It's Freddy Thresher, a first grader with a nose for trouble. It's not that he's trying to do anything bad. It's just that he's a boy who gets a little too creative and inventive when he has a problem.

Fancy Nancy and the Too-Loose Tooth by Jane O'Connor, illustrated by Robin Preiss Glasser

From chapters.ca:
Nancy absolutely must have her first tooth fall out at school. That way she will be sure to receive the special tooth- holder necklace from the school nurse. But when Nancy's tooth starts wiggling at home, she is worried she might lose it before class. How can Nancy make sure her loose tooth falls out at school? Readers will love this sixteenth addition to the best selling Fancy Nancy I Can Read series, as Nancy touches upon a subject near and dear to all.