1. The loosening of a tooth without displacement. It causes significant injury to the periodontal ligament with tenderness to percussion; it is usually accompanied by gingival bleeding. Primary incisors may change colour when subluxated due to pulpal damage; treatment for a primary tooth usually involves a soft diet. A permanent tooth may require splinting to prevent excessive mobility.
2. Partial dislocation of a joint. Subluxation of the temporomandibular joint can occur when the mandibular condyle is dislocated anterior to the articular eminence and cannot return to its normal position.