If you to make teeth white and keep brushing it forced a long time, it should from now on to change this practice. Recent studies have found that if you want to tooth brush into a pearl as whitening, by the middle of the day just two minutes to brush, brush rather than force every 5-10 minutes. Because the two brushing methods achieved the effect is the same. At the same time experts warned that the forced brushing can damage your teeth and gums.