The contour of the jawline can change the entire look of someone’s face. For those who have a naturally weak jawline, injectable dermal fillers can effectively create a more enhanced, strong jawline. Nasolabial Folds (Smile Lines): Smiles lines are the lines that run from the outer corner of the nose to the corners of the mouth. Dermal fillers injected into the nasolabial region gently lift up the smile lines, softening the appearance of the folds.