Back molars meaning wisdom teeth? If so, I wouldn’t be too worried about it. If your first and/or second molars don’t touch when you mew but do touch when you’re not, also wouldn’t worry about it. If they don’t touch no matter what you do, you probably have at least one tilted molar. Not a huge deal, something like Invisalign can help you out and if your molars really don’t touch it’s considered a bite issue. If this is the case, you likely have functional issues… you just didn’t notice it was potentially because of tilted teeth. Either way, there’s a very good chance insurance will cover braces if you legitimately have bite problems.