BOTOX is a neuromodulator. It works by interrupting signals between muscles and nerves to allow the skin to relax. This makes it ideal for areas where volume loss is not an issue.
Dermal fillers address volume loss, restoring a fuller and softer look to places such as the cheeks, temples, and underneath the eyes. Dermal fillers are more commonly used in folds. Fillers are also used in the lips and around the mouth.
While both products can address various lines and wrinkles throughout the face. They are fundamentally different and cannot be used for the same purposes. They can, however, be used in combination for complete facial rejuvenation.