Itsnotsobad, the sailor, is back from one of the distant trips to the Western countries. He brings back presents for the Sultan, and chooses a mysterious ointment to give to Iznogoud. Knowing the ambition of the Vizier, he tells him that this ointment - mere toothpaste actually - is a powerful poison. From then on, Iznogoud will try everything possible to get the sultan to brush his teeth.
—Anonymous