Occlusion is a general dental term that refers to the contact between your teeth. Specifically, how the upper teeth interact with the lower teeth. Malocclusions are, therefore, an improper placement of these teeth. This includes crowding and crooked teeth. Orthodontics concerns itself with proper alignment of teeth, so malocclusions cover the vast majority of what an orthodontist will do in their career.
Overbites
Overbites occur when the upper row of teeth significantly overlaps the lower row. This can cause complications with your oral health, cause gum decease, and even tooth lose.
Underbites occur when the lower row of teeth significantly overlaps the upper row. This is less common than overbites, but involves the same chewing issues, speech impediments, and jaw pain that overbites do.
Crossbites occur when you close your mouth and a portion of your upper teeth falls inside your lower teeth. This usually means the lower teeth are closer to the cheeks than the upper ones.
Openbites occur when the upper and lower teeth are both slanted in such a way that the rows of teeth do not touch when at rest. Openbites are a rare malocclusion, yet they cause all the same dental problems that other bites do, so they remain very serious.
Crowded teeth are the result of a jaw that is not large enough to accommodate all the teeth you have. This means that teeth are getting pushed together, twisted, or forced forward or backward.
Crooked teeth are very common in teenagers and adults alike. When baby teeth or permanent teeth begin coming in, they may move into a crooked position for a number of reasons: poor infant habits (such as overuse of pacifiers or thumb sucking), genetics, or just bad luck.