What factors affect the development of dental caries? What complications may result from dental caries? What are the causes and possible effects of periodontal disease? What are some of the major...

What factors affect the development of dental caries? What complications may result from dental caries? What are the causes and possible effects of periodontal disease?

What are some of the major causes of esophageal obstruction? What symptoms does esophageal obstruction produce?