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.
By BracesInfo.com Expert. Orthodontics is usually considered cosmetic under insurance companies. Medical insurance may cover procedures that are deemed medically necessary and vary case by case. Examples in which your medical insurance may cover orthodontics is when there are facial deformities, speech impediments, severe jaw pain, etc.