The PRESERVE TOOTHBRUSH was medically developed and depicts the most recent research in toothbrush design and function. The handle is made of 100% recycled content. This is important because at the current rate of replacement, yearly toothbrush waste comes to about 50,000,000 (that's MILLION!) pounds, and the replacement rate is expected to increase because we are beginning to listen to our dentists' advice against worn out bristles and bacterial build-up.