The Amabrush also works with braces. The bristles are soft and flexible so your braces won't be damaged. Note, however, that the bristles can be offset by the brackets in such a way that they cannot clean your teeth perfectly.
Therefore just like a normal manual or electric toothbrush, additional care for your teeth with braces will still be required. Interdental brushes are best suited for complete cleaning when wearing braces. Find out more about it here.