Having full, large lips is a sign of youthfulness. When we become older we lose volume en we lose support around the lips. This makes them less visible over time. If you do not have full lips of your own, you can change the shape of your lips by enhancing or enlarging the volume or contours of the lips.
There is an ideal ratio (the phi factor or “the golden ratio”) for the features in the face. This also applies to the ratio between the upper lip and the lower lip. By enhancing en restoring the volume of the lips with fillers using this ratio, you can bring back the most natural proportions of the lips.