To expose a mandibular lingual torus of a patient who has a full complement of teeth, the incision should be made in the gingival sulcus and embrasure area. This approach allows for better access to the underlying bone and helps to minimize damage to the surrounding tissues. The incision should be made with a scalpel or other surgical instrument, and care should be taken to avoid damaging the adjacent teeth or gums. Once the torus has been exposed, it may be removed using a surgical bur or other instrument.