Fillers basically restore lost volume to your face and plump areas, so that deep-set lines are smoothed. Why is this needed? As we get older our bodies stop producing collagen and elastin, both of which contribute to the youthful look.
Experts argue over when we start losing collagen, but the generally agreed age is 25. Pretty young, right? Your collagen and elastin levels then decline at a rate of about 2% per year. Your body will have stopped producing it altogether by your late twenties. How long they last depends how your body reacts and which hyaluronic acid is used, but most face fillers will last between six and 18 months.