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.
The reasons for braces and orthodontic treatment vary from patient to patient. Approximately 3 million American and Canadian teens have braces, with the number of adults beginning orthodontic treatment rising at a steady rate. Your dentist will typically be the first person to mention orthodontic treatment, and will likely send you or your loved one to see an orthodontist for a consultation.