What part of the body to elepjant tusks form from?

Elephant tusks are considered to be enlarged and elongated incisors. One third of the tusk is usually located deep inside the elephant's head while the remaining two third of the tusk can be seen outside. The part of the tusk located in the elephant's head is made up of tissues, nerves and blood and it is called pulp cavity. The outside part of the tusk is made up of dentine with an outer cover of enamel. Elephants use their tusks as weapons of fighting and it is also used for foraging and digging.