Cute smiley teeth stickers are a popular way to encourage good oral hygiene. These small, colorful stickers are often placed on toothbrushes, toothpaste tubes, or mirrors as a reminder to brush and floss regularly. They can also be used as a reward for children who brush their teeth well. Cute smiley teeth come in a variety of designs, from simple smiley faces to more elaborate characters. A Cute Smiley Tooth Sticker.