We all hate bad hair days—when our hair is just frizzy and all over the place! Ugh. Thankfully, we can prevent frizzy hair by merely changing the way we wash our tresses. So today, we've narrowed down the most common mistakes and how you can fix them to score gorgeous locks:1. Washing your hair every day.Washing your hair every day strips our scalp of its natural oils, making it dry and prone to d …