Nasolabial filler, also known as nasolabial fold filler or smile line filler, involves the use of dermal fillers to address the deep lines or folds that extend from the sides of the nose to the corners of the mouth, known as the nasolabial folds. These folds can become more prominent with age due to the loss of volume and elasticity in the skin. During nasolabial filler treatment, a healthcare provider injects filler into the nasolabial folds using a fine needle or cannula. The filler material is typically made from substances like hyaluronic acid, calcium hydroxylapatite, or poly-L-lactic acid. The goal of nasolabial filler treatment is to restore volume and smooth out the nasolabial folds, resulting in a softer and more youthful appearance. This can help reduce the appearance of lines and wrinkles around the mouth and create a more harmonious facial contour.