saliva:
    clear fluid in the mouth containing water, enzymes, bacteria, mucus, viruses, blood cells and undigested food particles
saliva ejector:
    suction tube placed in the mouth to remove saliva
salivary glands:
    located under tongue and in cheeks, produce saliva
scaling:
    meticulous removal of plaque and calculus from tooth surfaces
sealants:
    plastic material bonded in the grooves and pits of back teeth for the prevention of decay
secondary dentin:
    produced by the pulp in response to tooth irritation
sleep apnea:
    the periodic interruption or delay in breathing during sleep
space maintainer:
    dental device that holds the space lost through premature loss of baby teeth

splint:

    to connect two or more teeth so they function as a stronger single structure

supernumerary tooth:

    extra tooth