Perioperative dental trauma is an unpreventable, uncommon adverse event, being the first cause of claims for malpractice in anaesthesiology.Its main risk factors are poor dentition, previous dental restorations and difficult airway.It can present at any time during the perioperative period, mainly during intubation.In extubation it is related to the use of Guedel's oropharyngeal cannulas.In this article we describe and analyse a case of fracture of fixed upper maxillary dental prosthesis that occurred during the emergence of anesthesia.Recommendations on its prevention and management are given.