saliva: clear lubricating fluid in the mouth containing water, enzymes, bacteria, mucus, viruses, blood cells and undigested food particles.
salivary glands: glands located under tongue and in cheeks that produce saliva.
scaling and root planing: a deep-cleaning, nonsurgical procedure whereby plaque and tartar from above and below the gum line are scraped away (scaling) and rough spots on the tooth root are made smooth (planing).
sealants: a thin, clear or white resin substance that is applied to the biting surfaces of teeth to prevent decay.
sedative: a type of medication used to reduce pain and anxiety, and create a state of relaxation.
soft palate: the back one-third of the roof of the mouth composed of soft tissue.
space maintainer: dental device that holds the space lost through premature loss of baby teeth.
stains: can be either extrinsic or intrinsic. Extrinsic stain is located on the outside of the tooth surface originating from external substances such as tobacco, coffee, tea, or food; usually removed by polishing the teeth with an abrasive prophylaxis paste. Intrinsic stain originates from the ingestion of certain materials or chemical substances during tooth development, or from the presence of caries. This stain is permanent and cannot be removed.
stomatitis: an inflammation of the tissue underlying a denture. Ill-fitting dentures, poor dental hygiene, or a buildup of the fungus Candida albicans can cause the condition.
supernumerary tooth: an extra tooth.
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