If filling the fold alone looked odd, this line needs looking at too.
A hollow line running diagonally from below the cheekbone toward the nose makes the face look tired and deepens the nasolabial fold. Filling under this line with hyaluronic acid gives the front of the face a continuous surface. It is often looked at together with cheek volume.
One session lasts nine to eighteen months, varying by product. The area below the cheekbone moves when you smile, so it absorbs faster than the deep mid-face. The purpose is to fill a hollow line, so the volume placed is not large, which also affects how long it lasts.