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.
By Shelly Webb. Approximately 25 to 50 percent of kids need orthodontics, according to Dr. Timothy Stuhlmiller, DDS, CAGS, of Millersburg. Children should see an orthodontist by age 7 for an evaluation of their teeth and jaw, to determine whether braces will be necessary.