The zygomatic major, which resides in the cheek, tugs the lips upward, and the orbicularis oculi, which encircles the eye socket, squeezes the outside corners into the shape of a crow's foot.

The increasing occurrence of oral diseases and traumatic injuries worldwide largely fuels the growing demand for zygomatic and pterygoid implants. Conditions like periodontal disease, edentulism, and ...

All smiling involves contraction of the zygomatic major muscles, which lifts the corners of the mouth. But a Duchenne smile is characterised by the additional contraction of the orbicularis oculi ...