<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ghk.h-cdn.co/assets/cm/15/11/980x652/54ff49f19175c-03-ghk-teeth-whitening-s1.jpg>
<http://www.goodhousekeeping.com/health/g1092/ways-youre-ruining-your-teeth/>