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.
A limited-purpose FSA covers qualified out-of-pocket expenses for dental or vision care provided to you, your spouse, or dependents. Typical eligible expenses include: Qualified Dental Expenses. 1  Cleaning. 2  Fillings. 3  Crowns.