Hello and thank you for your question! Yes, both lip fillers and a lip flip can help enhance the appearance of a small top lip that disappears on the ends. Lip Fillers: These are injectable hyaluronic acid-based substances (e.g., Juvederm, Restylane) that add volume to the lips. If you want a fuller, more defined top lip, fillers can provide noticeable volume and shape, especially around the areas where your lip tends to disappear. The effects are immediate and typically last 6-12 months. Lip Flip: This involves small injections of Botox into the muscles just above your upper lip. It relaxes the muscle, causing your lip to slightly flip outward, giving the appearance of a fuller upper lip without adding actual volume. This technique is subtler than fillers and is ideal for "testing the waters" of having a fuller upper lip, lasting around 2 months. Your lip shape (the M shape) can be very tricky to treat with fillers, so be sure to see an experienced provider! Best of luck! Genie Alexander, RN BSN for Anna Petropoulos, MD FRCS at Center for Classic Beauty, Danvers & Boston, MA