About: http://webisa.webdatacommons.org/35693990

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	But if you avoid smoking and other staining agents such as coffee, tea, and red wine, the effects of professional teeth whitening can last one to two years before a touchup is needed, and most people are happy with the results.
http://www.w3.org/ns/prov#wasQuotedFrom	everydayhealth.com