although esthetic is a relative issue, depending upon the country and culture, almost all around the world, there is a consensus that a beautiful set of teeth is the one which is white and bright and is aligned regularly. in iran also the main feature of a beautiful tooth is its whiteness. during the past decades and centuries, tooth discoloration was considered as an esthetic issue and differe...

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Objective: Among the Setah Zaroriah, psychological events, they produce very fast and powerful effect on human body. The most important factor to maintaining health or creating disease is mediation spirits that created from steamy, delicate, fluid, which influences power verbs fastly. Methods: In this review study, available resources related subject of research in Iranian physicans Mohammad eb...

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