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The document discusses thyroid disease, including the normal thyroid gland and its hormones. It describes hyperthyroidism and hypothyroidism, their symptoms, signs, and treatments. Hyperthyroidism is caused by an overactive thyroid gland and may be treated through medications, surgery, or radioactive iodine. Hypothyroidism results from an underactive thyroid and can cause cretinism if untreated in infants. Dental problems may arise from thyroid disorders, and dentists can help diagnose issues by checking thyroid levels and ordering scans. Replacement hormones are commonly used to treat hypothyroidism.Read less