Which toothbrushes offer replacement heads?

The Source™ Brush comes in Flossing (Super Soft), Soft or Medium bristles.  The head is smaller than the Big Brush and is right and left-hand compatible. It depends which way you put the replacement head into the handle.
The TOUR™ Travel Brush uses the same replacement heads as the Source. Due to the unique design of the TOUR, the Big Brush Replacement Heads will not fit on the TOUR.
The Big Brush™ is the newest of our brushes to have replacement heads.  The head size is larger than the Source.  They come in right or left-handed versions and utilize the optimal 45-degree angle that the ADA recommends.  Look for the Big Brush Replacement Heads.
With our replacement head toothbrushes, you are keeping the handle for life and only replacing the heads.