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.
Determining Whether Orthodontics Are Medically Necessary Versus Purely Cosmetic. The ancient Greeks had a word for it â orthodontics â straight teeth. They even knew a way to make the crooked straight â using a combination of common metals and cat gut. And although the cats couldnât have been happy about it, humans have been smiling ever since.