**Question:** True about Torus mandibularis:

A. It is a bony outgrowth on the mandible
B. It is a rare congenital abnormality
C. It is a result of poor dental hygiene
D. It is associated with temporomandibular joint disorders

**Core Concept:**

Torus mandibularis is a developmental anomaly characterized by a bony outgrowth on the mandible. This benign condition occurs due to overgrowth of the mandibular bone, typically on the lingual or buccal surface of the mandible. The torus can be unilateral or bilateral, and its presence is often asymptomatic.

**Why the Correct Answer is Right:**

A. Torus mandibularis is indeed a bony outgrowth on the mandible, making option A the correct answer. It is a normal variation found in the human population and does not indicate any underlying pathology or dental abnormalities.

**Why Each Wrong Option is Incorrect:**

B. Torus mandibularis is not considered a rare congenital abnormality. It is a common occurrence in the general population and does not indicate any developmental issues or genetic abnormalities.

C. Torus mandibularis is not a result of poor dental hygiene or dental plaque accumulation. Its presence is determined by genetic and developmental factors rather than dental practices. Poor dental hygiene may exacerbate other dental issues, but it is not directly linked to torus mandibularis.

D. Torus mandibularis does not directly associate with temporomandibular joint disorders (TMD). While TMD can occur in some individuals with torus mandibularis, the presence of torus does not necessarily lead to TMD. TMD is caused by various factors, including dental occlusion, jaw joint abnormalities, and muscle imbalances.

**Clinical Pearl:**

Torus mandibularis is a common anatomical variation and does not indicate any pathological conditions or dental problems. While TMD can occur in some individuals with torus mandibularis, it is essential for students to understand that the presence of torus does not cause TMD and that TMD has various underlying etiologies.