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Science News Archive - June 19, 2003

Could cause permanent damage to your teeth, study findsHealthDayNews -- If you're a bit too enthusiastic when brushing your teeth, you could be doing more harm than good.Brushing your teeth longer and harder than is necessary may not be making your teeth any cleaner and could be causing permanent damage, says a study by researchers at the University of Newcastle upon Tyne, England.They found that when people using an electric toothbrush increased the length of their brushing and the amount of pressure they applied to their teeth, removal of harmful bacteria only improved up to a point.That type of aggressive brushing increased the risk of oral health problems including abrasion of tooth enamel or gums.While the 12 people in this study used an electric toothbrush, the researchers say the same findings hold true for people using ordinary toothbrushes.For this study, the electric toothbrush was wired into a computer than measured the length of time people brushed and the amount of pressur

By Randy Dotinga, HealthDay ReporterHealthDayNews -- Just in case you thought female sexuality couldn't get any more complicated.Researchers, armed with pornographic movies, say they have discovered that women, regardless of their sexual orientation, tend to be aroused by scenes featuring heterosexuals, lesbians or gay men.The world of sexual arousal is simpler for men.

Word of the Day
malpais
  • The ragged surface of a lava-flow.
'Malpais' translates from Spanish as 'bad land.'