Oregon Expanded Function Dental Assistant (EFDA) Practice Exam

Plaque primarily consists of bacteria and food particles. This sticky, colorless film builds up on teeth and can lead to dental issues if not removed through regular brushing and flossing. The bacteria in plaque feed on the sugars from food particles, producing acids that can harm tooth enamel and contribute to cavities and gum disease. Recognizing that plaque forms mostly from bacterial accumulation and organic debris helps one understand the importance of maintaining good oral hygiene practices to prevent its buildup and the associated dental problems. The other compositions listed, such as saliva and minerals, may play a role in the oral environment but do not constitute the primary makeup of plaque itself. Enamel particles and water are not relevant to the structure of plaque, and cementum and dentin pertain to the tooth's anatomy rather than the substances that comprise plaque. Thus, the focus on bacteria and food particles directly aligns with the understanding of plaque formation and its implications for oral health.