The authors report a case of tetanus diagnosed in the aftermath of tooth extraction, in the absence of any other front door.
Observation: A patient showed a persistent trismus several days after the extraction of tooth 38 performed at the dental office. The diffusion of tension and the appearance of paroxysms allowed the diagnosis of tetanus.
Discussion: The possibility of occurrence of tetanus after a tooth extraction should be kept in mind before a persistent trismus with rapid expansion in the neck and limbs. The dentist should be aware of the symptoms of tetanus to refer the patient to a specialized department.