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Calculus
Hard deposit of mineralized material adhering to crowns and/or roots of teeth.

Canal
A relatively narrow tubular passage or channel.

Root Canal
Space inside the root portion of a tooth containing pulp tissue.

Cariogenic
Promotes tooth decay.

Caries
Commonly used term for tooth decay.

Cavity
Decay in tooth caused by caries; also referred to as carious lesion.

Cementum
Hard connective tissue covering the tooth root.

Cleft Lip
Birth defect in which one or more fissures form in the upper lip, which takes place while the fetus is growing.

Cleft Palate
Congenital deformity resulting in lack of fusion of the soft and/or hard palate, either partial or complete.

Clenching
The clamping and pressing of the jaws and teeth together in centric occlusion, frequently associated with psychological stress or physical effort.

Composite
A dental restorative material made up of disparate or separate parts (e.g. resin and quartz particles).

Conscious Sedation 
A state in which patients are awake and can breathe and swallow on their own but are less aware of what is taking place.

Crown Anatomical Crown: That portion of tooth normally covered by, and including, enamel;

Abutment Crown: Artificial crown serving for the retention or support of a dental prosthesis;

Artificial Crown: Restoration covering or replacing the major part, or the whole of the clinical crown of a tooth;

Clinical Crown: That portion of a tooth not covered by supporting tissues.

Crown Lengthening: A surgical procedure exposing more tooth for restorative purposes by apically positioning the gingival margin and/or removing supporting bone.

Cusp
The pointed portion of the tooth.

Cyst
Pathological cavity, usually lined with epithelium, containing fluid or soft matter.