What is the Original Toothbrush?

The Original Toothbrush is one piece like the Flex Toothbrush, but made from cellulose and has no patterned grip on the handle. The Flex (Scuba) is very similar in shape and can be substituted. The Big Brush with Replaceab;e Head is an improved version of the Original....longer neck, less plastic and more bristles across the bristle bed.