<P> Tooth brushing is the act of scrubbing teeth with a toothbrush equipped with toothpaste . Since only two thirds of the outer tooth can be reached by a toothbrush, interdental cleaning (with floss or an interdental brush) can usefully accompany tooth brushing . Together, these two activities are the primary means of cleaning teeth, one of the main aspects of oral hygiene . </P> <P> Brushing teeth properly helps prevent cavities, and periodontal, or gum disease, which causes at least one - third of adult tooth loss . If teeth are not brushed correctly and frequently, it could lead to the calcification of saliva minerals, forming tartar . Tartar hardens (then referred to as' calculus') if not removed every 24 hours . Poor dental health has been associated with heart disease and shortened life expectancy . </P> <P> As long ago as 3000 B.C., the ancient Egyptians constructed crude toothbrushes from twigs and leaves to clean their teeth . Similarly, other cultures such as the Greeks, Romans, Arabs and Indians cleaned their teeth with twigs . Some would fray one end of the twig so that it could penetrate between the teeth more effectively . </P> <P> Modern day toothbrushing as a regular habit became prevalent in Europe after contact with the Muslim world in Africa and Asia where the people's teeth remained healthy into old age . It was advised as a scientifically supported practice toward the end of the 17th century . The modern toothbrush was developed in England in 1780 . While languishing in jail, Thomas Addis decided to drill holes into a sheep's tibia, and pulled through the bristles of boar hair . While he was credited with the discovery of the modern toothbrush, a similar design has since been discovered in China from 1400 . In the United States, although toothbrushes were available at the end of the 19th century, the practice did not become widespread until after the Second World War, when U.S. soldiers continued the toothbrushing that had been required during their military service . </P>

What did romans use to clean their teeth