Your stupid honestly. I'm sorry. But I just got my braces off last week after 2 1/2 years and I just got my retainers on thursday. And I've worn them all day for the past 2 days. My teeth did start to shift a little after just one week. Your teeth will shift back over time. And honestly it's selfish of you to not wear them. Because braces and really expensive and when your teeth do shift back to the way they were before, you basically just wasted your parents money. And I'm guessing they wouldn't pay for you to get them again, so then you will be stuck with crooked teeth. Have fun!