http://www.dentalfind.com/info/torus

Torus in which a bony elevation creates a hard visible mass in your mouth. It usually appears in the premolar area. Multiple masses can appear. Though it does not interfere with eating speaking or swallowing it can interfere with the application of dentures and will have to be removed. Torus palatinus does not cause symptoms.

The torus which appears only in adulthood is a developmental anomaly. It can continue to slowly grow throughout life. About 27/1000 adults experience this condition. It may be the outcome of mild constant decrease in blood supply to the membrane covering the surface of the bone resulting from mild pressures on the thin nasal membrane or a turning force of the arch of the lower jaw or sideways pressures from the roots of the underlying teeth though this theory is as yet unconfirmed.

Torus can appear in three forms: torus palatinus mandibular torus and buccal exostosis. The torus palatinus appears in the midline of the hard palate or the roof of your mouth. The mandibuluar torus appears on the lingual surface of the mandible—that is the portion of the lower jaw facing the tongue. The buccal exostosis appears on the facial surface of the alveolar bone—the outward-facing side of the bone that forms the tooth sockets surrounding the teeth. Tori found anywhere else in the mouth are usually diagnosed as one of two conditions: an osteoma a slowly growing benign tumour made of bone tissue or an exostosis a trauma-induced overgrowth of bone tissue. The bone proliferation must be specifically located in order to qualify as a torus. It is difficult to differentiate an exostosis from an osteoma unless the bony proliferation is associated with an osteoma-producing syndrome.

Tori range from 1.5 to 3 or 4 centimetres in diameter. The condition seems to be hereditary and is especially widespread among Asian populations.

Torus consists of dense layered bone with scattered osteocytes and small marrow spaces filled with fatty marrow and other tissues. A slim frame of outer bone on top of inactive cancellous or porous bone with considerable fatty or hematopoietic (red blood cell-forming) marrow surrounds some lesions.

Hope that helps and you find out what it is soon. Take care

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