Personalized Dental Hygienist Funny Floss Em Hippo Long Sleeve T-Shirt. Funny dental hygienist or dental assistant Long Sleeve T-Shirt - Black with hippopotamus and Floss Em quote. Also perfect for a dentist or dental office staff. 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