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Your teeth are fixed to your jawbone in your mouth. They sit in a curved line along your top and bottom jaws. The white part of your tooth that you can see when you smile or open your mouth is called the crown. Some of your tooth is hidden under the skin (gum) in your mouth. This is called the root and you cannot see this in your mouth. The white covering on your tooth is called enamel. Dental enamel is strong and helps to protect the tooth. Dental enamel is the hardest thing in your whole body.
Your first set of baby teeth would have appeared through your gums when you were about six months old. You should have had twenty teeth by the time you were about two-and-a-half years old. These teeth began to fall out when you were about six years old to make way for your adult (permanent) teeth.
All your adult teeth should be in your mouth by the time you are about thirteen. You should have twenty-eight adult teeth. When you are between eighteen and twenty-five you may also start to get four more back teeth, at the top and bottom. These are called your ‘wisdom teeth' as people used to think that you got them when you had knowledge and became wise. This makes the total number of teeth you will have in your mouth thirty-two.
It is important to look after your adult teeth, as you will not get any more. As soon as your teeth appear in your mouth you could get tooth decay if you do not look after them properly.
Plaque is a creamy, sticky coating of germs (bacteria) that collect on everybody's teeth every day. The germs won't harm you, but they can harm your teeth. Tooth decay is caused by acid from the bacteria (plaque acids), which can cause a hole (cavity) in the enamel of your tooth. Tooth decay may make your tooth ache. If this happens you need to see a dentist, who may have to clean the hole and put a filling in the tooth to repair it.
You need to brush your teeth to remove all the plaque and to keep your teeth and gums healthy. It is important to brush your teeth twice a day while the plaque is still soft. Brushing your teeth should be part of your daily routine, just like washing your hands and face and brushing your hair.
Your teeth do different jobs. They help you to cut up and chew your food when you are eating. They help you to talk and make different sounds. They also give your face its shape and they give you a nice smile.
You have four different types of teeth:
The main cause of tooth decay is the sugar that is in the food and drinks you have. Every time you eat or drink anything sugary your teeth are under attack from the plaque acids for up to one hour. This is because the sugar mixes with the bacteria in the plaque to produce the harmful plaque acids.
This is why it is important to keep sugary foods and drinks to mealtimes only. If you are hungry between meals then you should choose foods that are kind to your teeth and do not have added sugar.
Here are some foods that are kind to your teeth: fresh fruit, raw vegetable pieces, plain popcorn, cheese, breadsticks, plain yoghurt, rice cakes, unsweetened cereal, crumpets, plain bagels, cheese scones and nuts.
When you are thirsty, plain water and plain milk are the kindest drinks for your teeth. If you drink fruit juices you should keep them to mealtimes only and add water to them. It's best to drink fruit juices and fizzy drinks through a straw to help cut down the number of acid attacks on your teeth.