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"It doesn\u00E2\u20AC\u2122t take long for a thin layer of cement to dry and become so hardened it has to be jack-hammered away, but when it&amp;#039;s just poured, it&amp;#039;s easy enough to wash away with some gentle force. Plaque is the same way. As it&amp;#039;s forming in the mouth, it&amp;#039;s not hard to gently brush, rinse and spit away, but once it&amp;#039;s hardened, tiny &amp;quot;jackhammers&amp;quot; and more than a little force are needed to chip it off our teeth. How can we be hard on plaque and banish it from our mouths while it&amp;#039;s still soft? Test your methods and know-how here."^^<http://www.w3.org/2001/XMLSchema#string>
<http://health.howstuffworks.com/wellness/oral-care/problems/dental-plaque-quiz20.htm>