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"While they won&amp;#039;t whiten your teeth like bleaching products will, natural teeth whitening methods brighten your smile by removing surface stains and helping strengthen teeth enamel. Test your knowledge of modern day and historical teeth whitening options that are bleach-free."^^<http://www.w3.org/2001/XMLSchema#string>
<http://health.howstuffworks.com/wellness/oral-care/products/natural-tooth-whitening-quiz3.htm>