Dental occlusion: how the upper and lower teeth meet
The word occlusion comes from a Latin word meaning to close. In dentistry it means the contact between the teeth of the upper and lower jaws. Dentists look at occlusion at rest, when you close fully, and when you slide the jaw to chew or move side to side.
In a normal occlusion the upper teeth sit slightly over and outside the lower teeth, the pointed cusps of the back teeth fit into the grooves of the opposite teeth, and the biting load is spread across many teeth. Knowing the types of teeth helps, because each type has a different part to play when the jaws close.
Malocclusion classes: Class I, Class II and Class III
Malocclusion means an occlusion that is not ideal, from slightly crowded teeth to a clear jaw mismatch. The common system, called Angle's classification, compares where the upper and lower first molars meet and how the jaws relate. Our general guide on malocclusion goes deeper.
Most people have some small deviation, and many have a bite that works well even if it is not textbook. Classes describe a pattern, not how serious it is.
| Class | How the bite looks | Common related terms |
|---|---|---|
| Class I | Jaws line up normally, but teeth may be crowded, spaced or rotated | Crowding, spacing, crossbite, open bite |
| Class II | Upper teeth and jaw sit forward of the lower ones | Overjet, overbite, buck teeth |
| Class III | Lower teeth and jaw sit forward of the upper ones | Underbite, front crossbite |
The three classes of malocclusion in simple terms: general information, not a diagnosis.
Why occlusion matters, and what to do about a poor bite
A bite that does not meet well can make chewing less efficient, wear teeth unevenly, make them harder to clean and, in some people, add to jaw muscle strain. Many people with a mild malocclusion have no symptoms at all.
Treatment ranges from simple observation to braces or aligners to move teeth, appliances in growing children, and jaw surgery combined with braces for large skeletal differences. Related bite patterns are explained in our guides on overjet, underbite and overbite. If you are worried about your bite, ask an orthodontist to check it.
Common questions
What is the meaning of occlusion in simple words?
It means how your upper and lower teeth fit together when you bite or close your mouth.
What is the difference between occlusion and malocclusion?
Occlusion is the general term for how teeth meet. Malocclusion means that they meet in a way that is not ideal.
Is Class II or Class III malocclusion worse?
Neither is simply worse. The class names a pattern. Severity depends on how large the difference is and what it affects.
Can adults correct their occlusion?
Yes, many adults do, using braces or aligners, and in larger skeletal cases with surgery. The teeth and gums need to be healthy first.
About this page
This page is general information, not a diagnosis or a quotation. Prices are prevailing Lucknow market ranges. Your own treatment and cost are determined after an examination. For questions about your own case, call +91 83036 12717.