Lip fillers are a type of dermal filler that are injected into the lips to add volume. The most common type of lip filler is synthetic hyaluronic acid (HA), which is a natural substance found in the body. Some popular brands of lip fillers include Juvederm, Restylane, and Perlane. Lip fillers can be used to increase the size of the lips, restore a previous lip size, or address the effects of aging on the lips. During the procedure, a topical anesthetic is applied to the lips to numb them, and then a thin needle is used to inject the filler into the lips. The effects of lip fillers typically last around 6 months, after which more injections are needed to maintain the volume of the lips.

In summary, the filler used for lips is typically a synthetic hyaluronic acid (HA) dermal filler, which is injected into the lips to add volume.