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.
An orthodontist can prevent dental irregularities in children by conducting exams before all of the permanent teeth erupt. A child should ideally have his or her first visit with a specialist around the age of seven, especially when there is a family history of crooked teeth and malocclusions.