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It might be a good idea to brush with the radio on, since dentists generally recommend brushing three to four minutes, the average length of a song. Using an egg timer is another way to measure your brushing time. Patients generally think they're brushing longer, but most spend less than a minute brushing.
To make sure you're doing a thorough job and not missing any spots, patients are advised to brush the full three to four minutes twice a day, instead of brushing quickly five or more times through the day. Reviewed: January 2012