______ is hardened plaque on your teeth.

Cavity

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Tartar

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Tooth decay

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Peridontis

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Solution

The correct option is B
Tartar

Plaque is sticky and a colourless film containing bacteria and food. It builds up naturally on tooth surfaces and along the gum line. Bacteria in the palque produces acids that attack your tooth enamel and can damage your gums and create cavities. When plaque accumulates and is not removed, it can mineralize, trap stains and turn into tartar.

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Question 13.
To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is
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