Why Has Ganesh One Broken Tooth? How Did Ganesha Become Ekdunt, One-Tusked?

Why has Ganesh one broken tooth? How did Ganesha become Ekdunt, one-tusked?

There are various Vedic narrations about Lord Ganesha losing one of his tusks in the Puranas. Once, Parashuraam visited the Himalayan Mountain (Kailash) to meet Lord Shiva who was fast asleep. Lord Ganesha ensured that no one disturbed Lord Shiva. When Parashuraam insisted Ganesha on letting him meet Shiva, both of them broke into arguments and then a fight. Ganesh grabbed him with his trunk and struck him on the ground. In turn, Parashuraam hurled his Pharasaa (axe) at Ganesha. Ganesh right away recognized it as His father's weapon that was given to Parashuraam by Lord Shiva and hence received it with all his humbleness on his one tusk. As a result, the tusk broke apart.

Another story mentions that while writing the great epic Mahabharata under the authorship of sage Vyaas, Ganesha realized the insufficiency of any ordinary pen to undertake the humongous task. Therefore, He broke one of his own tusks and used it as a pen. One story mentions that demonic king Ravana picked a fight with Lord Ganesha and forcibly took out one of his tusks. He made ivory earrings for his beautiful queen with this.