Eat and drink to your heart's content! Kiwi is right!!
I have to share a funny staining story with you though:
I
did find something that stained my brackets

....if only temporarilly.
I made an amazing
RED VELVET CHEESECAKE. Even after brushing, the edges of my brackets were still
red!
At the time I was thinking, "oh no! But, it was SO WORTH IT!!" After brushing 2 more times with a whitening toothpaste I was still a little
red. By morning, all was gone back to normal. I will still eat that beautiful thing, but only at night! And, only when there is no company in the house.
