[Recommended Seoul Orthodontic Clinic] If Your Mouth Doesn’t Close Properly and Your Teeth Are Misaligned: Check the Types of Malocclusion

If your mouth doesn’t close properly and your teeth are misaligned?

Let’s check the types of malocclusion.

Hello, this is S Leader Dental Hospital, a recommended orthodontic clinic in Seoul.

Orthodontic treatment is not simply about aligning the teeth neatly. It is a complex treatment that must also take into account the positional relationship between the upper and lower jaws, chewing function, speech,

and even facial balance. In particular, when malocclusion is present, structural imbalance in the jawbones often accompanies the problem, not just tooth alignment, so a more precise diagnosis and treatment plan are essential.

In dentistry, this type of bite problem is commonly classified using Angle’s classification into Class I, Class II, and Class III, and the treatment goals and approaches differ according to each type.

Today, we will take a closer look at the definitions and characteristics of Class I, Class II, and Class III malocclusion, as well as the direction of orthodontic treatment for each.

How does orthodontic treatment differ based on the diagnosis of Class I, Class II, and Class III malocclusion?

Not all crooked teeth require the same orthodontic treatment. Malocclusion is a complex issue that requires consideration not only of tooth alignment but also of

jaw position, imbalance in maxillomandibular growth, and the overall facial balance. Therefore, accurate classification and diagnosis are the key to a treatment plan. In particular, dentistry divides malocclusion into Class I, Class II, and Class III according to Angle’s classification, and the treatment method and approach differ depending on each condition.

Class I Malocclusion: when the bite is normal but the tooth alignment is a problem

Class I malocclusion is the most common type. In broad terms, the molar relationship is close to normal, but there is a problem with the alignment of the front teeth or the entire dental arch. Common examples include crowded teeth, overlapping teeth, insufficient space, or, conversely, too much

space causing gaps between the teeth. Although it may appear to be only an aesthetic issue, this

imbalance can worsen gum health, cause food to get stuck easily, lead to abnormal tooth wear, and in the long term may also place strain on the temporomandibular joint.

Treatment is relatively straightforward, and in most cases it can be done without extraction, though in some cases premolar extraction may be included. Various appliances can be used, such as clear aligners (Invisalign), lingual braces, and self-ligating brackets, and the choice can be made according to the patient’s age, lifestyle, and aesthetic needs. Orthodontic treatment usually takes about 1 to 2 years, and after treatment,

a retainer must be used to maintain stable results.

Class II Malocclusion: when the upper jaw protrudes or the lower jaw is retruded

Class II malocclusion refers to cases in which the upper jaw is positioned too far forward or the lower jaw is relatively retruded, and it is often associated with what we commonly call protruding front teeth or a protrusive mouth. This type of malocclusion can make the mouth look protruded from the side and make it difficult to close the lips, or cause a person to unconsciously push the lips forward. In addition to aesthetic concerns, it can also involve functional problems. In severe cases, symptoms such as dry mouth, cracked lips, and a gummy smile may appear.

Treatment for Class II malocclusion varies greatly depending on age and skeletal condition. For adolescents in the growth period, approaches such as headgear or functional appliances can be used to promote mandibular growth or restrict maxillary growth.

If this period is used well, relatively effective results can be achieved without surgery. On the other hand, in adults,

skeletal growth has already stopped, so extraction orthodontics to move the upper front teeth backward is common, and in cases of severe protrusion, surgical orthodontic treatment combined with jaw surgery may be necessary. In particular, when improving lip shape or the side profile is the main goal, tooth movement alone has limitations, making an accurate diagnosis important.

Class III Malocclusion: a protruding lower jaw, or underbite appearance

Class III malocclusion refers to cases in which the lower jaw protrudes too far forward or the upper jaw is underdeveloped, and it is also called a "prognathic jaw." Even if there is little difference from the front, from the side the lower jaw may appear protruded, making facial proportions look awkward. It can also make the lower front teeth show more when smiling or cause speech inaccuracies. In terms of bite, it is characterized by a reverse bite (underbite), where the lower front teeth overlap the upper front teeth.

Because Class III malocclusion often involves skeletal issues, trying to correct only the tooth alignment alone makes it difficult to achieve satisfactory results. In children or adolescents who are still growing, growth modification devices can be used to suppress mandibular growth and encourage forward growth of the upper jaw, allowing relatively stable results to be expected. However, for adults,

because the position of the jawbone itself must be adjusted, orthognathic surgery is often needed in addition to orthodontic treatment. Before and after surgery,

orthodontic treatment to move the teeth into the ideal position must be performed, and the overall treatment period is relatively long, averaging 2 to 3 years or more.

Accurate diagnosis comes first; treatment results are determined by precise analysis.

All three types of malocclusion—Class I, Class II, and Class III—can be treated orthodontically, but the treatment directions and goals are very different. The important point is that an individualized plan must be established after comprehensively analyzing each patient’s jaw position, tooth alignment, age, growth potential, and facial harmony. Even with the same Class II malocclusion, some people may achieve sufficient improvement without extraction, while others may require a surgical approach due to skeletal problems.

Therefore, rather than judging whether orthodontic treatment is needed based only on the visible tooth alignment, a professional consultation based on precise diagnosis and examination is essential. Accurate assessment of the current condition through detailed imaging (cephalometric analysis), temporomandibular joint function tests, oral scans, and frontal and lateral facial analysis, followed by setting the appropriate treatment direction, leads to good results.

Orthodontics is a

holistic treatment that considers both function and aesthetics.

Treatment for malocclusion is not simply aimed at creating a beautiful tooth alignment. It is a "holistic treatment" that includes improving chewing function, stabilizing the temporomandibular joint, making oral hygiene easier, and further restoring overall facial harmony and confidence.

Especially for adolescents in the growth period, if problems are detected early and treatment is carried out according to the growth pattern, much greater results can be expected without surgery. Even for adults whose growth has already been completed, satisfactory results can still be achieved through accurate diagnosis and a customized plan, so if you are curious about your current bite condition, we recommend receiving professional consultation at a nearby dental clinic.