ADA NBDHE Dental Hygienist

Answer: D - Streptococcus mutans and Lactobacilli are common cariogenic bacteria found in coronal caries. Streptococcus mutans use sucrose to generate a sticky polysaccharide that adheres to tooth’s surface. Additional sugars digested by Streptococcus mutans such as fructose, glucose, and lactose produce lactic acid. Lactobacilli often live in the digestive track and vagina symbolically; however, it increases oral acidity, thus working in concert with Streptococcusmutans. Fluoride can reduce the total number of Lactobacilli.