This depends on the technique and the areas treated.
Ptosis generally occurs when the product reaches the levator muscles of the upper eyelid. This can occur when attempting to inject the frown lines or the forehead. In many instances, this occurs when individuals request complete eradication of wrinkles or lines requiring greater than average doses. It is less likely with lower doses and introducing more than 2 cm (a fingerbreadth or more) above the eyebrow with multiple concentrated lower volume injections.