Kipi keeps her teeth the way they are because she's too humble and modest. They are her only flaw. If she were to have her only flaw removed she would cease to be a mere human and ascend to some sort of status as a goddess. She doesn't want this, she's happy among the peons she keeps as company. Truly, her modesty and glory is evident through the fact she tolerates the inferiority around her with such compassion.