People brush their teeth for a number of reasons, such as to sense oral fresh-ness, to feel confidence from having a nice smile, to avoid bad breath, and to prevent oral disease. Oral cleanliness is important for the preservation of oral health and the maintenance of a functional dentition throughout life. Oral hy-giene procedures remove plaque and prevent plaque from accumulating on teeth. There is substantial evidence showing that tooth brushing and other mechanical procedures can remove plaque to reasonable extent, provided that cleaning is performed thoroughly.