Why do humans want there teeth ?

Humans want their teeth because they are treasured as jewellery  .The Great White Sharks have 3,000 teeth at any one time .They are triangular , serrated saw edge .The teeth are located in rows which rotate in use as needed, the first rows are used in obtaining prey .The other rows rotate into place as needed .As they are lost, broken or worn down .They are replaced by new teeth that rotate into place.