D2I2.
common

Torus mandibularis

Torus mandibularis is a bony growth in the mandible along the surface nearest to the tongue. Mandibular tori usually are present near the premolars and above the location on the mandible of the mylohyoid muscle attachment. In 90% of cases, a torus is on both inner sides of the mandible ; however, they may differ in size.

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Plain-language summary adapted from Wikipedia. Not medical advice.