Subgingival scaling involves the removal of subgingival calculus from the tooth surface. This can be from the enamel (crown) or from the root cementum surface, in which case it is termed root planing. Subgingival curettage or root planing can be closed or open. If open, some form of flap will have been made to aid vision and improve efficiency.
Inadequate removal leaves an inflammatory focus present and the disease process will continue. Continued attachment loss will cause further deepening of the pocket.