what are lip fillers made of

Lip fillers are a type of dermal filler that increase the volume of the lips. They are made of a variety of substances, but the most common type is hyaluronic acid (HA) . HA is a natural substance found in the body that helps keep the skin hydrated. Other types of filler materials can include collagen, which is derived from animal tissue, or synthetic materials like polymethylmethacrylate (PMMA) . Lip fillers typically last 12 to 18 months, depending on factors such as age and metabolism. During a lip filler procedure, a healthcare provider will apply a topical anesthetic to the lips, and then use a thin needle to inject the filler material.