If the teeth are not cleaned regularly, they become covered with a sticky yellowish layer W of food particles and bacteria. Since layer W covers the teeth, the alkaline liquid X secreted by glands Y inside the mouth cannot reach the teeth surface to neutralise the acid formed by the action of organisms Z on sugary food, and hence tooth decay sets in.
- What is W known as?
- What is (i) X, and (ii) Y?
- What are organisms Z?
- State one way of removing layer W from the teeth.
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- W is the dental plaque.
- X refers to the saliva.
- Y refers to the salivary glands.
- Organisms Z are bacteria.
- Layer of W, i.e. dental plaque, can be removed by regular brushing of teeth.
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