Dental Admissions Test (DAT) Practice Test

What does the term "plaque" refer to in oral health?

1. A soft, sticky biofilm of bacteria that forms on teeth

2. A hard substance that protects teeth from decay

3. A type of dental treatment for cavities

4. A whitening agent used in oral care

The correct answer is: A soft, sticky biofilm of bacteria that forms on teeth

The term "plaque" in oral health specifically refers to a soft, sticky biofilm of bacteria that adheres to the surfaces of teeth and gums. This biofilm is primarily made up of bacteria, food particles, and saliva. When dental plaque is allowed to remain on the teeth without proper brushing and flossing, it can lead to various oral health issues, including cavities and gum disease. The presence of plaque is significant because it provides a favorable environment for bacteria to thrive, which can produce acids that cause demineralization of tooth enamel, ultimately leading to decay. Moreover, plaque can calcify over time to form tartar, making it harder to remove and necessitating professional dental cleaning. Understanding this definition is essential for preventative dental care and promoting overall oral hygiene. The other options refer to different dental contexts: the hard substance mentioned relates to the enamel that protects teeth, dental treatments may involve various methods to treat cavities but do not define plaque, and whitening agents are used for cosmetic purposes and are not directly related to the issue of plaque.