I am hoping someone here can help me and answer my questions.\n\nI am likely going to have to have a failed root canaled tooth extracted. The tooth is an upper left first molar. From the xrays taken during the endodontic treatment, it appears that one of the roots of this tooth runs directly into my left maxillary sinus.\n\nI am going to be seeing a new dentist on Wednesday to talk about my options. What can/should I ask during the consultation in order to reduce the risk of sinus perforation? Is there any way of determining for certain if the root does run into the sinus? Are there any procedures I can request that would minimise the risk?