About: http://webisa.webdatacommons.org/249048087

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	Tooth enamel is mostly made up of hydroxyapatite, which is extremely scratch resistant while toothbrushes are made of nylon, which is extremely soft.
http://www.w3.org/ns/prov#wasQuotedFrom	reddit.com