Holes in the two outer layers of a tooth call ed the enamel
and the dentin. The enamel is the outermost white hard surface and the dentin is
the yellow layer just beneath enamel. Both layers serve to protect the inner living
tooth tissue called the pulp, where blood vessels and nerves reside. Small cavities
may not cause pain, and may be unnoticed by the patient. Larger cavities can collect
food, and the inner pulp of the affected tooth can become irritated by bacterial
toxins, foods that are cold, hot, sour, or sweet - causing toothache. Also referred
to as caries.
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