Which of the following describes the radiographic appearance of calculus?

A) A pointed projection extending from the side of the tooth
B) Ringlike and encircling the neck of the tooth
C) A fuzzy speck barely visible against the side of the tooth
D) All of the above

D
Explanation: A) Depending on the density and the amount of the deposit, calculus may appear as pointed or irregular projections on the proximal root surfaces, or as a ringlike radiopacity around the cervical neck of a tooth, or as a fuzzy speck barely visible against the side of the tooth.
B) Depending on the density and the amount of the deposit, calculus may appear as pointed or irregular projections on the proximal root surfaces, or as a ringlike radiopacity around the cervical neck of a tooth, or as a fuzzy speck barely visible against the side of the tooth.
C) Depending on the density and the amount of the deposit, calculus may appear as pointed or irregular projections on the proximal root surfaces, or as a ringlike radiopacity around the cervical neck of a tooth, or as a fuzzy speck barely visible against the side of the tooth.
D) Depending on the density and the amount of the deposit, calculus may appear as pointed or irregular projections on the proximal root surfaces, or as a ringlike radiopacity around the cervical neck of a tooth, or as a fuzzy speck barely visible against the side of the tooth.