An underbite occurs when the lower jaw projects beyond the upper. At that point the bottom teeth will sit in front of the upper teeth in a closed mouth. This condition will affect between 5% and 10% of the population. It is the opposite of an overbite where the lower jaw sits too far behind the upper.
As in most conditions, an underbite can range from mild to severe. However, even a slight underbite can cause significant difficulties.
In adults, it is frequently found that more invasive treatments are required, although braces are still a primary option.
Underbites can cause both physical and mental concerns, but it is fortunate that today underbites can be corrected, despite any severity of the condition.