A Light Touch for Two Minutes

Researchers studied the brushing techniques and times of 12 volunteers who used electric toothbrushes during a four-week study. The participants were taught how to use the oscillating toothbrush, which was hooked up to a computer that took time and pressure measurements. Researchers compared 16 combinations of various brushing times and pressures. Plaque levels on the teeth were also recorded before and after brushing.

They found that plaque removal improved with longer brushing time up to two minutes and with greater pressure up to 150 grams of pressure, which is about the weight of an orange.

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'Although we found that you have to brush your teeth reasonably long and hard to get rid of the harmful plaque which causes dental diseases, our research shows that once you go beyond a certain point, you aren't being any more effective,' says Heaseman, in a news release. 'You could be actually harming your teeth and gums.'

Heaseman says the same results would also be expected if the volunteers had used ordinary toothbrushes rather than the electronic versions.

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Researchers say the force necessary to brush your teeth is actually quite light because the pressure is being applied to a very small area.

'If you are unsure how to go about brushing your teeth, the best thing to do is to make an appointment with your dentist or dental hygienist who will be able to train you in the correct techniques and will show you approximately how much pressure you should be applying,' says Heaseman.