1. Leaving food on your teeth when you go to sleep can cause white spots. White spots are when the acid from bacteria eats away at the enamel and changes the composition of the enamel. 2. Leaving food can cause bad breath!!! So rinse with mouth wash, brush, and brush your tongue! 3. Leaving food can cause your gums to be inflamed! This can cause pain and possibly slow down your treatment! #braces #whitespots #bracestips