Yes! soda is very corrosive on teeth, when you drink soda you are breaking down the enamel around the brackets of your braces. When you get the braces off you will have little yellow squares where your brackets used to be. And soda can get rest on the underside of your brackets on your back teeth and cause holes. Trust me, I have seen it and it is not attractive at all. Just drink tea or lemonade. On the plus side, soda is bad for you anyways. Hope this helps! If you do decide to drink soda, be sure to brush afterwards.