Personalized Straightening Up Youth T-Shirt. Orthodontist, straightening up, one tooth at a time text with a row of teeth is a humorous dental design for birthdays and holidays. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.