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.
Invisalign Orthodontics: FSA Eligibility. Invisalign orthodontics reimbursement is eligible with a flexible spending account (FSA), health savings account (HSA) or a health reimbursement arrangement (HRA). Invisalign orthodontics reimbursement is not eligible with a limited care flexible spending account (LCFSA) or a dependent care flexible spending account (DCFSA).