What Is Malocclusion
Malocclusion refers to misalignment of your teeth and jaws—essentially, a bad bite. Your bite is considered normal when your upper teeth overlap your lower teeth by about 20-30%, and your back teeth contact properly during chewing. When teeth don't align correctly, the result is malocclusion, ranging from minor cosmetic issues to serious functional and health problems.
Malocclusion develops from a combination of genetic and environmental factors. You may inherit jaw size or tooth dimensions that don't match optimally. Childhood habits like thumb sucking, tongue thrusting, or prolonged pacifier use can alter dental development. Missing teeth, extra teeth, or teeth that are abnormally sized can contribute to bite problems. Additionally, jaw injuries or TMJ disorders can affect your bite.
Overbite: Upper Teeth Protruding
An overbite occurs when upper front teeth overlap lower front teeth excessively, extending more than 3-4 millimeters horizontally. Patients with overbites often feel self-conscious about their appearance and may have difficulty closing their lips comfortably. Overbites can cause accelerated wear on lower front teeth, as they strike the back surfaces of upper front teeth during chewing.
Severe overbites can affect speech and chewing function. They're often hereditary, though childhood habits like thumb sucking and tongue thrusting can contribute. Overbites are among the most common orthodontic problems and respond well to treatment with braces or clear aligners.
Underbite: Lower Teeth Protruding
An underbite is the opposite problem, where lower front teeth extend beyond upper front teeth. This creates an appearance sometimes called a "bulldog" appearance. Underbites are typically genetic and often run in families. They can cause significant chewing difficulties and may worsen with time if left untreated.
Severe underbites may require surgical intervention in addition to orthodontics to correct jaw position. Even moderate underbites should be addressed because they can lead to accelerated wear on upper front teeth and compromise chewing efficiency.
Open Bite: Teeth Don't Meet
An open bite exists when upper and lower teeth don't contact when you close your mouth. This may affect only front teeth (anterior open bite) or back teeth (posterior open bite). Open bites seriously compromise chewing efficiency and often develop from childhood tongue thrusting habits, finger sucking, or mouth breathing.
Open bites can significantly affect speech and facial appearance. They're often more challenging to correct than other bite problems and may require extended orthodontic treatment, sometimes combined with surgical intervention in adults.
Crossbite: Teeth Crossed Over
A crossbite occurs when teeth from one jaw overlap teeth from the opposite jaw in an abnormal lateral direction. Anterior crossbites affect front teeth, while posterior crossbites affect back teeth. Crossbites can occur on one side (unilateral) or both sides (bilateral) of the mouth.
Crossbites cause the jaw to shift to one side during closure, creating an asymmetrical bite. This asymmetry can lead to uneven wearing of teeth, jaw joint problems, and headaches. Crossbites are often correctable with early orthodontic intervention.
Crowding and Spacing Issues
Crowding occurs when insufficient space exists for all teeth to align properly. Teeth overlap, twist, or become severely misaligned. This common problem makes cleaning between teeth difficult, increasing cavity and gum disease risk. Severe crowding affects appearance and may impact chewing and speech.
Spacing problems, where gaps exist between teeth, are less common than crowding. These gaps can trap food and contribute to gum disease. Small spacing issues may simply be cosmetic concerns, but larger gaps affect function and appearance.
Health Consequences of Malocclusion
Beyond appearance, malocclusion has functional implications. Improper chewing reduces food breakdown, potentially affecting digestion. Bite problems cause uneven tooth wear, reducing tooth longevity. Misalignment complicates oral hygiene, increasing cavity and gum disease risk. Severe malocclusion can cause jaw joint problems, headaches, and facial pain.
Treatment Options
Orthodontic treatment is the primary approach for correcting malocclusion. Traditional braces, using metal brackets and wires, remain highly effective for all types of bite problems. Clear aligner systems like Invisalign are increasingly popular, particularly for adults, and work well for mild to moderate problems. More severe cases typically require traditional braces.
Treatment duration varies depending on severity but generally takes 18-36 months. Treatment may involve tooth extraction if severe crowding exists or requires moving teeth significantly. In adults with very severe malocclusion involving jaw size discrepancies, surgical correction combined with orthodontics may be necessary.
Age Considerations
Early orthodontic evaluation in childhood (around age 7) allows identification of developing bite problems. Some issues are easier to correct when bones are still developing. However, orthodontic treatment can be successful at any age. Many adults pursue bite correction for both functional and aesthetic reasons. Adult treatment takes slightly longer due to slower bone remodeling but produces excellent results.
When to See Your Dentist
Ask your dentist about your bite alignment. If you notice crowding, spacing, or jaw position concerns, discuss orthodontic evaluation. Early intervention prevents complications and may reduce treatment complexity.