Which statement best describes dental plaque?

• A. Hard deposits on the enamel
• B. A film of minerals on tooth surfaces
• C. Soft deposits near the gums and between the teeth consisting of bacteria and by-products
• D. Microbial biofilm on the tongue

Answer: (C)

Dental plaque is a soft, sticky biofilm that forms on tooth surfaces. It consists of bacteria and their metabolic by-products embedded in a slimy matrix, and it tends to accumulate most where cleaning is less effective—along the gumline and between teeth. This description fits plaque, distinguishing it from hard mineralized deposits (calculus) and from microbial film on the tongue, since plaque specifically refers to the film on teeth. Regular removal through brushing and flossing helps prevent the problems plaque can cause, like gingivitis and caries.