https://www.selleckchem.com/pr....oducts/ly3200882.htm
The shape and fullness of the lips are essential in facial aesthetics. We describe a safe injection technique of hyaluronic acid (HA), based on the well-known golden number Φ (phi), for lip augmentation. The name given to that procedure is "the step-by-step Φ technique." Firstly, "step-by-step" because we never inject more than 1-1.5 ml of HA in 1 session, and "phi" because we apply the golden ratio 1.618-broadly known as Φ-to identify the proper points for injection. Using a specific caliper, we identified 3-4 points in each upper ha
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