[header] How to fix an overbite [title] Check your teeth alignment by biting down and smiling. [step] To see if you have an overbite, let your mouth close normally, your teeth resting in their natural position. With your teeth clenched shut, smile into a mirror and look for areas where one row of teeth overlaps another. 
Though some very slight overlap is normal, seek medical attention if your teeth seem severely misaligned. [substeps] Overbite is considered severe when the teeth overlap by 3.5 millimetres (0.14 in) or more.