The first two Iranian tourists called Omidvar brothers, travelled around the world since 1954 for ten years.
In one of the travels to central Africa, in Itvory Jungles, they interred Pigme Tribe. People of this tribe are the shortest people in the world; adult men grow to less than 130 cm in average height.
In this tribe, it is a rule to sharp the front teeth of girls and boys after puberty. Chieftain of tribe sharps teeth of girls and boys after their puberty in the shape of Triangle with a sharp stone. This Custom is a symbol of Physical and mental growth of young persons who have entered a new period of life. It is notable that having sharp teeth is the license of marriage.