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In our modern competitive society, a pleasing appearance often means the difference between success and failure in both our personal and professional lives. Scottish physiologist Charles bell (1774-1842) was quoted as remarking that the thought is to the word that the feeling is to the facial expression. He pointed out in 1806 that a smile could convey a thousand different meanings, yet it is the most easily recognized expression. And because the mouth is one of the focal points of the face , it should come as no surprise that the smile plays a major role in how we perceive ourselves, as well...