Its shape and design allow you to see all angles of your tooth, which you otherwise would not be visible by simply looking in the bathroom mirror. Seeing all sides and angles of your tooth allows you to see into your mouth the same way the dentist does when you go into the office. Moms and Dads: check your kids' mouths in between dental visits using this mirror! Although small cavities are frequently hard to see, your kids may have large cavities and you would easily be able to see them. Another thing to look for in the mouth is tartar / calculus. Look at the backside of the lower teeth especially.