... companies or individuals who were not registered with it and who illegally carried out the business of dentistry. The HKDA has also taken measures to further reinforce regulations governing tooth whitening treatment and the use of dental whitening ...
http://www.scmp.com/lifestyle/health/article/1286347/tooth-whitening-popular-procedure-it-can-be-harmful
http://www.scmp.com/lifestyle/health/article/1286347/tooth-whitening-popular-procedure-it-can-be-harmful
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