Diligent use of sunscreen can also slow or temporarily prevent the development of wrinkles, dark spots, sagging and the development of skin cancer. Depending on the mode of action, sunscreens can be classified into physical sunscreens (i.e., zinc oxide and titanium dioxide, which stay on the surface of the skin and mainly deflect the UV light) or chemical sunscreens (i.e., UV organic filters, which absorb the UV light).