2TeethUnlike your heart or brain, your teeth were not ready to work from the day you were born. Although babies have the beginnings of their first teeth even before they are born, teeth don't become visible until babies are a few months old.
3After that first tooth breaks through, more and more teeth begin to appear. Most children have their first set of teeth by the time they are 3 years old. These are sometimes called milk teeth or baby teeth, and there are 20 in all. When a child grows to age 5 or 6, these teeth start falling out, one by one.
4A baby tooth falls out because it is being pushed out of the way by a permanent tooth that is behind it. Slowly, the permanent teeth grow in and take the place of your baby teeth. By about age 14, most of you will have lost all of your baby teeth and have a full set of permanent teeth.
5Different types of teeth You have different types of teeth to do different jobs.IncisorsIncisors are at the front of your mouth. They have flat, sharp edges like a knife because they have to cut your food when you bite it.
6CaninesCanine teeth are the fang-like teeth at the front of your mouth. They are long and pointed so that they can tear through tough food like meat.
7Premolars and MolarsThese teeth are at the sides and back of your mouth. They grind the food up so it is easier to swallow.premolarsmolars
8This picture shows a full set of adult teeth This picture shows a full set of adult teeth. There are 32 teeth in an adult mouth. When you are very young you only have 20 teeth. Your jaw has to grow to fit all your teeth in!
9If you cut a tooth in half the inside would look like this. Inside your teethIf you cut a tooth in half the inside would look like this.The part of your tooth that shows is called the Crown.enameldentinpulpThe part of your tooth that is in your gum is called the Root.gumcementumjaw bone
10enamelThe crown of each tooth is covered with enamel which is very hard and often shiny. Enamel is a very tough substance and it acts as a tooth's personal bodyguard. Enamel works as a barrier, protecting the inside parts of the tooth.
11dentinIf you were able to peel away the enamel, you would find dentin. Dentin makes up the largest part of the tooth and is similar to bone. Although it is not as tough as enamel, it is also very hard.
12pulpDentin protects the innermost part of the tooth, called the pulp. The pulp is where each tooth's nerve endings are found. When you eat very hot soup, cold ice cream, or fall and hurt your teeth, it's your pulp that hurts. The nerve endings inside the pulp send messages to the brain about what's going on. The pulp also contains the tooth's blood vessels, which feed the tooth and keep it alive and healthy.
13cementumBoth the dentin and the pulp go all the way down into the root of the tooth, which is under the gum. Cementum which is like your body's glue, holds the root of each tooth to your jawbone.
14Lets have another inside our mouth at our teeth. Incisors are for cutting our food.Canines are for tearing our food.Premolars and Molars are for grinding our food.