The anatomical relationship between the floor of maxillary sinus and maxillary posterior teeth always possess a challenge in dentistry, especially during the endodontic and extraction procedures. Maxillary sinus often pneumatize between the molar roots and results in proximity between them. Odontogenic sinusitis incidence is of 10% to 12% of a well-recognized phenomena. The most common cause is foreign body displacement into the sinus. The most common foreign body in the maxillary sinus is an extracted maxillary tooth followed by a displaced root. This article reports a case in which a root was displaced to the most medial superior margin of the maxillary sinus. The palatal root was displaced during extraction of the left maxillary second molar and was retrieved after three days of the incidence.