Summarize this article in one sentence.
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. Overbite is considered severe when the teeth overlap by 3.5 millimetres (0.14in) or more. For accurate measurements, visit your dentist or orthodontist. If you're not sure whether your overbite requires medical attention and aren't ready to spend money on an orthodontic screening, check with your dentist. Ask for a dental checkup or exam, in which the dentist looks at the condition of each individual tooth and your general dental health. If the option is available, ask for an x-ray to see if you have one of the following types of malocclusion: Class 1 malocclusion, where the bite is normal but the top teeth slightly overlap the bottom teeth. Class 2 malocclusion, where the bite is not normal and there is severe overlap. Class 3 malocclusion, where the bottom teeth overlap the top teeth. An orthodontist will be able to tell you what's necessary to fix your overbite, how much it will cost, and how long it will take. Look for individuals who have a Doctorate of Dental Surgery (DDS) and have completed a 2 to 3 year orthodontic specialty program. Before undergoing treatment, confirm that your orthodontist is registered with the American Board of Orthodontics. If you have trouble finding local orthodontists, ask your dentist for in-network recommendations.

Summary:
Check your teeth alignment by biting down and smiling. Get a dental checkup. Find an accredited orthodontist.