Nasolabial sulcus is a common expression wrinkle now, which is mainly located on both sides of the alar and extends to the upper edge of the mouth. However, when people make various facial expressions, nasolabial groove will appear.

The advantage of filling nasolabial groove with hyaluronic acid is that the main component comes from biological tissue and is a substance existing in human body, which is particularly safe and has obvious filling effect.

The nasolabial sulcus is a body surface sign that separates the cheek from the mandible, and it is a secondary wrinkle of redundant skin, also known as the two sides of the "facial danger triangle". At the same time, nasolabial groove plays a vital role in facial expression activities. Nasolabial sulcus has existed since birth, and it is accompanied by a person's life. The nasolabial groove has also experienced the process from shallow to deep, from narrow to wide, from short to long.