Deep lines can be improved by injecting hyaluronic acid, facelift surgery or facial thread sculpture. 1. Hyaluronic acid injection: Hyaluronic acid has a moisturizing effect and can make the skin firmer after injection. By injecting hyaluronic acid, it can help to improve the situation of deep lines when you smile. 2. Facelift surgery: the skin is lifted upward through surgery, then the excess skin tissue is removed, and finally the incision site is sutured, which can effectively remove facial wrinkles and improve the deep smile lines. 3. Facial thread sculpture: by implanting special beauty threads in the skin, the skin will be lifted upward and tightened, and at the same time, the buried beauty threads can also stimulate the regeneration of collagen under the skin, which can improve the facial wrinkles, and improve the situation of deep lines of the decree of the smile. It is recommended that patients visit the hospital in time, and under the guidance and advice of the doctor, choose the appropriate way to improve the situation of deep smile lines.