Medical

Your chest is on the front of your body, below your neck and above your waist. Adult men usually grow hair on their chests.
The top part of your body including your chest and back is called your torso.

A chiropractor is someone who manipulates the bones and muscles in your body. These manipulations can help restore balance in the body and make you feel better.

A cigarette is a roll of paper, filled with finely chopped tobacco and other additives. People who use cigarettes are called smokers. Modern cigarettes usually have a filter at one end. The unfiltered end is set on fire and the other end is put in the mouth, and smokers inhale the smoke through the cigarette.

A cleavage is the hole left after you cleave something. More commonly though, a cleavage is the space between a woman's breasts.

A cramp is a pain in one of your muscles that often happens after exercise, or are caused by low salts in your blood. Cramps can hit suddenly and can be extremely painful. The person in the picture has a cramp in their leg.

A crest is the highest part of something, or something on the top of something else. The bird in the picture has a crest of feathers on top of its head.

Crutches are pieces of wood with padded handles that you use to help you walk. You tuck the ends of the crutches under your arms.
People usually use crutches when they have a broken leg or sprained ankle. If you can't walk at all, you will need a wheelchair.

Dandruff is when your head under your hair loses little white flakes of skin and they get caught in your hair or fall onto your shoulders. Dandruff can be itchy like in the picture, or just not be nice to look at.
You can buy special shampoo to get rid of dandruff.

A dentist is someone who looks after other people's teeth. They clean your teeth properly, and fix up holes in people's teeth. They can also make your teeth look better by straightening or whitening them. Sometimes going to see the dentist can be painful or scarey, so if you don't want a dentist trip to be bad, you should look after your teeth and brush them every day.

You, or a part of your body, is diseased if it is not working properly for some reason. Disease can be caused by a contagious illness, poison, genetic condition or other imbalances.