If you currently have braces you do not want to try and use any whiting products until your braces are removed. This is because you will not be whiting the area you braces are covering. I would suggest that for now just continue with your good brushing and flossing habits. Once you get off your braces the your dentist can always whiten your teeth then. If you are still worried talk to your dentist tell them how you are feeling. They will be able to advise you so that you will understanding on what is going on.
I hope this has helped