Dental Problems
A dental cavity is a hole in the 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.
Braces are used on people with crooked teeth or after an injury.
Internal Organs
The heart pumps blood to all parts of the body through a system of arteries and veins.
It's located in the chest, between the lungs, and beats about once per second.
The kidneys remove waste and toxins from the blood.
They are bean shaped organs and are about 10 centimeters long and 6 centimeters wide.
The lungs exchange oxygen from the air with carbon dioxide from the blood.
They expand when inhaling air, and contract when exhaling air.
The stomach is below the heart, and it's part of the digestive system.
It uses acids to digest food before passing it to the small intestine.
The bladder is a balloon shaped organ that collects urine from the kidneys.
In an adult, the bladder can hold about half a liter of urine.
