The Big Brush™/Flex™ Brush is too big for my mouth. Is the Source™ Toothbrush smaller?

Yes, though we do recommend using your new RADIUS toothbrush for a whole week before deciding if you don't like it. The bigger head can take some getting used to!

The Big Brush™ features a wide oval head designed to improve gum health and massage your whole mouth. If our Big Brush™ still feels too large after trying for a week, the Source™ Toothbrush is a great alternative. It has a smaller head, a slim, longer neck for reaching tight spaces, and does not have the 45-degree angle.

The Source™ head is about 50% smaller than the Big Brush™ and Flex™ Brush but still contains 200–300% more bristles than an ordinary toothbrush. All of our replacement heads are interchangeable, so you can use Big Brush Replacement Heads with the Source handle and vice versa.

Nov 10, 2025

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