Commonest complication of Caldwell-Luc operation is

"The most common complication is paresthesia of the cheek, teeth and gingiva secondary to stretch injury of the infraorbital nerve". ─ Microendoscopic surgery "The most common complication is postoperative hypoesthesia of cheek and teeth". — Head & Neck surgery : otolaryngology Complications of Caldwell - Luc operation Postoperative bleeding. This can be controlled by a nasal pack Anaesthesia of the cheek due to stretching of the infraorbital nerve. It may last for a few weeks or months. Anaesthesia of teeth Injury to nasolacrimal duct Sublabial fistula (oroantral fistula) Osteomyelitis of maxilla (rare)