Thank you for your excellent question. In general, we think of Botox as relaxing or softening the activity of the injected muscle by binding to the acetylcholine receptor and blocking the ability of the muscle to contract. This is how Botox creates an aesthetically pleasing softening of the facial lines and creases on the overlying skin. So, how then can Botox create a lift? Some facial muscles are considered "elevators" and others "depressors." By injecting Botox into a depressor muscle at the lateral brow (separate from the glabellar area), it can soften the tendency of that muscle to pull the brow down, causing a several millimeter elevation or lift of the lateral brow. In my opinion, achieving a pleasing look with Botox depends on an expert evaluation of the activity of the facial muscles (elevators and depressors), presence or absence of baseline brow asymmetries, and degree of upper eyelid skin redundancy. You can definitely achieve a pleasing aesthetic result with a chemical brow lift, but please be sure to see an experienced injector for a full facial evaluation and to discuss your individual goals. Best wishes!