WHAT ARE TEETH LIKE?
Teeth are part of the skeleton. Like bones, they are alive.
The outside of a tooth is covered with a hard white substance called enamel. Enamel is the hardest substance in our body . Dentin, which is not very hard, is under the enamel. Pulp is the centre of the tooth. The pulp is the living part of the tooth and contains blood vessels and nerve endings.
The roots are fixed into jawbone. But we cannot see them because they are bellow the gums. The part of the tooth above the gums is called the crown.
When babies are born, their teeth are inside the jawbone. The milk teeth, or baby teeth, break through little by little. At about six year old, milk teeth began to fall out and permanent teeth appear.
Source: Essential Science 5. Ed. Santillana
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The outside of a tooth is covered with a hard white substance called enamel. Enamel is the hardest substance in our body . Dentin, which is not very hard, is under the enamel. Pulp is the centre of the tooth. The pulp is the living part of the tooth and contains blood vessels and nerve endings.
The roots are fixed into jawbone. But we cannot see them because they are bellow the gums. The part of the tooth above the gums is called the crown.
When babies are born, their teeth are inside the jawbone. The milk teeth, or baby teeth, break through little by little. At about six year old, milk teeth began to fall out and permanent teeth appear.
Source: Essential Science 5. Ed. Santillana