Monophasic hyaluronic acid and biphasic hyaluronic acid have some differences in physical form and efficacy. 1. Both of them use hyaluronic acid as the starting raw material, only the difference in the production process leads to a different physical form. Monophasic Hyaluronic Acid: The large block of hyaluronic acid gel is ground to form a smooth and delicate gel-like texture, without adding any other ingredients made of smooth, uniform texture, cross-linked uniform gel, like jelly. Biphasic hyaluronic acid: sieve a block of hyaluronic acid gel into particles of hyaluronic acid “hard block”, and then mixed with hyaluronic acid liquid, modulation into products, for the crosslinking particles + non-crosslinking liquid mixed preparations, just like sago dew. 2. Difference in efficacy. Monophasic hyaluronic acid is not easy to diffuse and shift, strong support, uniform metabolism, easy to push and inject, high viscosity value, long-lasting shaping, suitable for chin augmentation, rhinoplasty, facial lifting, filling deep wrinkles and so on. Biphasic hyaluronic acid is easier to diffuse because of its granularity, faster pre-metabolism, high elasticity, good viscosity and good ductility. It is suitable for the lips, nasolabial folds, skin surface wrinkles and other parts that require high degree of filling. It is recommended that patients who have the desire to fill go to a regular medical institution, find a specialist physician to choose the appropriate injectables for filling treatment after an interview, in order to avoid adverse consequences.