| http://www.w3.org/ns/prov#value | - Shapes have changed a bit, bristle length varies, but the overall concept is the same.There are really three kinds of toothbrushes: there are your standard non-powered brushes which most people use; there are electric toothbrushes" that first came around in the 1950's; and there are high-powered electric models (also called "sonic toothbrushes) that were first developed in the 1980's.
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