Must be doing something wrong-every time a dental technician works on me, she attempts to teach me a new method of how to brush my teeth! That is, what I am doing wrong-there is a proper placement and angle that the brush must be placed-apparently. Unfortunately for me, I just put the brush in the mouth, and simply brush, i.e., while checking my reflection in the mirror out to see if I can get away without shaving for the day! Do believe there is a conspiracy going with on tooth Luddites/dental technicians-point is to keep you returning forever to the dentist's office. Yet, must confess, like all the magazines in his office. Site below is small, but has a number of informative links that may be of interest in what to do to initially, and avoid a lecture by your dental hygienist!
http://en.wikipedia.org/wiki/Tooth_brushing