[Complications due to an oral injury caused by diving].

A 42-year-old man presented himself with a complaint of recurrent swelling of the chin. After clinical and radiographic examination, it was shown to be an injury caused by the use of an insufficiently disinfected mouthpiece when diving at an exotic destination. Oral injuries caused by diving mouthpieces are widely known. It is less well known that an untreated injury can ultimately lead to tooth loss.