Is Teeth Whitening a Good Idea for Someone with Stains from Braces?

I had braces for three years but unfortunately did not look after them whilst I had them on. My teeth are quite stained in the areas that the braces used to be so I was wondering if getting them whitened would be a good idea? On holiday this year I enquired and was told that it would result in me having uneven shades on my teeth with some dark and some white. However, that was the only opinion that I got and was wondering if I could get my teeth successfully whitened without any patches?