Dermal fillers are a type of treatment aimed at correcting wrinkles without surgery. The procedure involves injecting substances such as hyaluronic acid to remove wrinkles and restore the skin firmness, especially in the corners of the mouth, the upper lips, eyebrows, forehead or cheek. The filler is injected with a fine needle and not too deeply. Depending on the type of substance applied, the duration of the effects vary. Among the different existing facial fillers, the most used are: hyaluronic acid, a natural substance that adds volume to tissues and stimulates collagen production thanks to its high water content and collagen, an essential protein from the skin, which replaces the collagen that has been lost in the treated area. Both are effective in removing deep wrinkles and fine lines. Another popular substance used is calcium hydroxyapatite, or Radiesse, a mineral gel compound, calcium and water, suitable for deep wrinkles.