Which type of caries is typically described as root caries on the root surface?

• A. Proximal caries
• B. Occlusal caries
• C. Root caries
• D. Facial caries

Answer: (C)

Root caries occur on exposed root surfaces, typically where gingival recession has left the cementum exposed. This location defines the name: caries that develop on the root surface are called root caries. The root surface is composed of cementum and dentin, which are less mineralized than enamel, making them more susceptible to acid attack and often allowing lesions to begin at the cervical area and progress along the root. Other surface-descriptor terms refer to caries on enamel-covered areas away from the root—between teeth (proximal), on chewing surfaces (occlusal), or on facial surfaces—so describing a lesion as root caries specifically indicates it is on the root surface.