About: http://webisa.webdatacommons.org/382550370

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	Unfortunately, the abrading materials in these known oral preparations do not differentiate between tar and other materials, such as the actual surface of the teeth.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es