American Board of Orthodontics (ABO) Practice Exam

A flat smile arc is a term used in orthodontics to describe the alignment of the upper dental arch in relation to the lower lip and facial aesthetics. In untreated patients, dental and facial aesthetics can vary widely, and studies have shown that a significant portion of the population exhibits this particular alignment.

The reported percentage of untreated patients displaying a flat smile arc is indeed around 5%. This finding suggests that most individuals either have a smile arc that is more convex or one that fits into a normal aesthetic range. The prevalence of a flat smile arc is relatively low, indicating that it is not a common characteristic among the general population.

Understanding the percentage allows orthodontists to recognize certain trends in smile aesthetics and develop treatment plans that consider these variations, aiming for a pleasing and functional outcome. This information can inform clinical decision-making and patient education when discussing treatment options and expected aesthetic goals.