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Which of the following is the leading cause of tooth loss in adults: caries, old age, periodontal diseases, lack of home care?

According to the Centers for Disease Control and Prevention (CDC), nearly half of all adults over 30 in the United States have some form of periodontal disease. This widespread condition answers the question, which of the following is the leading cause of tooth loss in adults: caries, old age, periodontal diseases, lack of home care?