1 If X is a topological (or metric) space and M is a metric space, then the set of all bounded continuous functions from X to M forms a metric space if we define the metric as above: d (f, g) = sup x in X d (f (x), g (x)) for any bounded continuous functions f and g.
Invisalign is orthodontic appliance, so since orthodontic treatment is allowed as an FSA expense, Invisalign is covered. Different companies have different rules concerning amounts set aside and the timing of how funds are used for orthodontics.
Once you graduate from an orthodontics program, you can apply for licensure from your state board of dentistry. Most states license orthodontists as dental specialists. To complete this process, you may need to submit dental school transcripts and passing scores on both parts of the National Board Dental Examination.