Tooth decay is the breakdown of tooth enamel. Enamel is the hard outer surface of a tooth. Tooth decay can lead to cavities.
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A baby's first tooth usually appears between 5 and 7 months of age. Often, the two middle bottom teeth come through the gums first, followed by the middle four upper teeth.
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Periodontal disease is a serious bacterial infection. It destroys the gums and the nearby tissues of the mouth.
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Thumb sucking is normal in infants and young children. It shouldn't cause any permanent problems if your child stops by age 5.
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