About: http://webisa.webdatacommons.org/200316600

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	The fact that the prior art devices do not provide effective means for cleaning the teeth and massaging the gums is the most likely factor responsible for the apparent lack of commercial success of any of the devices.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com