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.
As you prepare for braces and the costs associated with them, keep in mind these general tips: 1) Orthodontia for cleft care should NOT be filed with dental insurance. Use dental insurance for routine cleaning and other dental care, but NOT for braces. 2) Orthodontia for cleft care SHOULD be filed with medical/health insurance. 3) Your orthodontist or surgeon should document medical necessity for the medical/health insurance claim.