Violation

Which of the following is/are characterized by an obliteration of pulp chambers and root canals? 1. Ageing. 2. Chronic trauma. 3. Dentinal dysplasia. 4. Taurodontism.

(1) (2) (3)

(1) and (3)

(2) and (4)

(4) only

All of the above.

Please describe the matter of abuse