Use the words in the diagram to complete the gaps (1-8

Use the words in the diagram to complete the gaps (1-8 . Listen and check.
A tooth has two main parts. The 1 .....is the part you can see 1
and the 2 .... is the unseen part that is below the
3 .......and fastens the tooth in the 4 ....The outer _
part of the tooth and the hardest substance in the body is
5 ......Underneath this is a layer of 6 ......which is
softer than enamel but similar to bone. In the middle of the tooth
9 is the 7 .....This contains cells, blood vessels
and the nerve of the tooth. The pulp is protected by a layer called 8 ......which covers the root u and keeps the tooth securely attached in the gum.