National Dental Assisting Examining Board (NDAEB) Practice Exam

Which three factors must be present for the formation of dental caries?

1. Deficient enamel, dietary sugars, and certain bacteria

2. Susceptible tooth, diet rich in fermentable carbohydrates, and specific bacteria

3. Fluoride deficiency, acidic diet, and dry mouth

4. Poor oral hygiene, high saliva levels, and strong enamel

The correct answer is: Susceptible tooth, diet rich in fermentable carbohydrates, and specific bacteria

The formation of dental caries, also known as cavities, is a complex process that requires the presence of specific factors. The correct answer emphasizes three essential components for caries development: - A susceptible tooth: This factor recognizes that some teeth are more prone to decay due to their structure, location, and overall health. Teeth with grooves, pits, or developmental defects, for instance, are more likely to harbor plaque and bacteria. - Diet rich in fermentable carbohydrates: The consumption of sugars and other fermentable carbohydrates provides the necessary energy for bacteria to thrive. When these carbohydrates are metabolized by bacteria in the mouth, they produce acids that can demineralize the enamel. - Specific bacteria: Certain bacteria, particularly Streptococcus mutans and Lactobacillus species, are primarily responsible for the initiation and progression of carious lesions. These bacteria thrive in an environment rich in sugars and are adept at producing acid, assisting in the demineralization process of tooth structure. Understanding these three interconnected factors highlights that dental caries development is not merely a result of poor oral hygiene but involves a combination of host (tooth) susceptibility, diet, and pathogenic microbial presence. This comprehensive approach to caries formation is critical in preventive dentistry.