173. Narrowing of periodontal ligament in labially placed mandibular canine with age is due to_____________?

A. Due to deposition of cementum and bone
B. Down growths of gingival epithelium
C. Gingival cysts formed from cell rests
D. Reversal of function of horizontal and oblique fibres
✅ The correct answer is option A. Due to deposition of cementum and bone.

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