Final answer:
An underbite is a condition where the mandible is positioned ahead of the maxilla, causing misalignment of the teeth and potential chewing and speaking difficulties. The correct option is B) underbite.
Step-by-step explanation:
The condition where the mandible is positioned ahead of the maxilla is called an underbite. This is a form of malocclusion, where there is a misalignment between the upper and lower teeth. It's the opposite of an overbite, where the upper teeth protrude beyond the lower teeth. Underbites can be caused by various factors including genetics, early loss of baby or adult teeth, or excessive thumb sucking during childhood. It is important to treat an underbite as it can lead to difficulties in chewing and speaking and may cause jaw pain or wear and tear on the teeth. Treatments can vary based on the severity of the underbite and may include braces, clear aligners, or in severe cases, surgery.
Underbites can be caused by various factors, including genetics, jaw size discrepancies, improper oral habits, or a combination of these factors. Treatment for an underbite may include orthodontic braces, dental appliances, or in some cases, surgical intervention.