A dental cavity is a hole in a tooth.
A cavity is caused by bacteria in the mouth.
Brushing your teeth frequently and regularly can help prevent cavities.
A cracked tooth can be caused by biting down on something hard.
Dentists treat a cracked tooth by covering it with a crown.
A dental x-ray is a picture of your teeth and gums.
An x-ray shows what can't be seen on the surface of the teeth and gums.
Braces are used by dentists to straighten teeth over a period of years.
Though braces are usually for children, they can also be used for adults with crooked teeth.
To extract a tooth means to remove it from the mouth.
Dentists have to pull hard to extract a tooth.
(Dentists often inject something into the gum to block the pain during the extraction process.)
