Malocclusion isn’t usually bad for your health and is considered a cosmetic problem. You may not like the appearance of your teeth if they’re crooked, even if it doesn’t cause you harm.

His definition of a Class I occlusion, the perfect occlusion, was based upon a dry skull that he kept on a shelf in his study. It was affectionately known as 'Old Glory'.

Both are types of dental malocclusion. The main difference between a crossbite and an underbite is that a crossbite only impacts a group of teeth, and an underbite affects them all.