What has research indicated about periodontal disease and dental caries?
A) That periodontal disease and caries is contagious.
B) That periodontal disease and caries can be genetic.
C) That periodontal disease and caries is due to a chromosome deficiency.
D) That periodontal disease and caries can be reversed.
B
Explanation: B) In 1995, the potential impact of gene therapy on dentistry was published; this finding was based on initial studies of gene transfer applications to salivary glands, keratinocytes, and cancer cells. It is now evident that a genetic basis exists for most diseases including periodontal disease and dental caries.
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