Final answer:
The non-surgical removal of calculus and necrotic cementum from the root of a tooth is called scaling and root planing. This involves the removal of hardened plaque from the teeth and smoothing of the root surfaces.
Step-by-step explanation:
The non-surgical removal of calculus and necrotic cementum from the root of a tooth is called scaling and root planing.
Scaling involves the removal of hardened plaque, known as calculus or tartar, from the surface of the teeth and below the gumline. This is done using special dental tools.
Root planing is the smoothing of the root surfaces to remove any rough or infected areas, preventing further plaque buildup and promoting healing of the gums.