Most lip augmentation procedures in North America are performed using a commercially prepared hyaluronic acid (eg. Juvederm and Restylane). When used for lip augmentation, these products will slowly resorb with many patients seek re-injection after 6-9 months. Manufactures price these products by sterile prepackaged single use syringes usually in 0.8-1.1 ml volumes.Most treating doctors price lip augmentation by the number of prepackaged syringes opened at a single visit. Subsequent treatment is usually priced similarly. Most patients wish to know 1) can fillers be shared with other patients or friends? 2) what happens to unused product? 3) can the product be stored and used at future visits? Firstly, no reputable doctor will share used syringes and needles between patients for fear of disease transmission. However, a freshly opened sterile syringe of hyaluronic acid can be subdivided into smaller quantities with a special syringe connector. These sterile subdivided quantities can be used in different patients. Secondly, manufacturers recommend the use of HA fillers as single use product. Following manufacturer recommendations, most doctors discard unused product.Thirdly, there exists microbiological studies on bacterial contamination of previously opened and stored HA syringes. When an opened syringe of HA filler is promptly recapped, the HA product usually remains sterile for up to 6 weeks. A minority of practitioners use this as the rationale for product storage and subsequent reuse at a later date.