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I assume the purpose is to relax the patient and keep his mind away from the procedure[i know it keeps my mind away from it] and to enable the dentist to finish his work more quickly.Do they really expect a verbal response with their tools in your mouth or physical response like waving your hand in confirmation or denial.Complex answers are a little difficult to answer by waving your hands if you are uneducated in the hand language.http://www.fotosearch.com/photoalto/hand-language/PHT185/
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