A generation ago, we would not see so many adolescents with braces as we do currently. Orthodontics, the branch of dentistry involved in the use of braces to align and move teeth to form that perfect arch, has seen rapid advancements in the past few decades and continues to grow at a rapid pace.
The fundamental principle is that teeth are held in place by surrounding elastic tissues, and minor constant forces can be applied to align them better. Small metal brackets are applied on the teeth and a wire is passed through them so that there is a constant force on the teeth. The amount and direction of force is managed by the doctor. The younger the age, the more elastic the tissue is, the easier it is to move teeth.
There are two main things to understand in terms of your options - relation of age with orthodontic treatment and the choices of braces.
Firstly, it has a correlation with age. Over the years, more people in their 20s and early 30s are choosing to have braces. Though the teeth and more importantly the surrounding periodontium become less elastic with age, the amount of force exerted is increased and therefore tooth movement is enabled. Also, in older patients, tooth removal may be required more frequently to make space for proper alignment.
Second is the choice of braces.
So, if you want to improve your smile, consult a dentist and find out how!