Riya loves eating chocolates and candies every day and sometimes forgets to brush her teeth at night. Now, she has a bad toothache. What has probably happened to her tooth?

Answer: C. It has a cavity (a hole).

Explanation:
When we eat sugary things and don't brush our teeth, tiny germs make a hole in the tooth called a cavity. This hole makes the tooth hurt. To fix it, a dentist cleans the hole and fills it with a special white material. Brushing twice a day stops cavities from happening.

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