Personalized Straightening Up Long Sleeve 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. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL