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 few common FSA-qualified costs include: 1  Copays for medical treatments & doctor visits, 2  Hospital & Doctor fees for medical tests & services like X-rays & cancer screenings. 3  Physical Rehabilitation. 4  Dental & Orthodontic expenses like cleanings, fillings, or braces. 5  Inpatient treatment for alcohol or drug addiction.