Overbite – Your upper front teeth overlap with your lower front teeth. Underbite – Your lower front teeth are in front of your upper teeth when you close your mouth. Crossbite – Some of your upper teeth are sitting inside your lower teeth when you close your mouth. Teeth Gap – You have extra space between two or more of your teeth. Open Bite – Your upper and lower teeth don’t touch when your mouth is closed. Crowded Teeth – You do not have enough room in your jaw for your teeth to fit normally. Teeth can crowd together, overlap and twist, or sometimes get pushed to the front or the back.