Restylane® is a facial filler that enhances lips and reduces the look of nasolabial folds. Restylane® is a non-animal, biodegradable gel based on a natural substance, called hyaluronic acid. Hyaluronic acid is found in your body and is a natural substance. It is injected in the skin in small amounts by a tiny needle, and it adds an instant, long-lasting, natural enhancement to your skin. As the molecules in Restylane® dissolve water is drawn into the voided areas. This helps it maintain the effect over a longer period of time. The amount of time Restylane® lasts depends on factors such as structure of skin, lifestyle and age. Most people choose to have a touch-up done within a year of the original treatment. The injections take about 30 minutes with immediate results. The treated area may be slightly swollen, tender and red for 1-5 days. Restylane® is injected below the surface of the skin, filling in unwanted lines and wrinkles and adding definition to the lip border.