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.
How to become an Orthodontist. In order to become an orthodontist, prospective students must first become licensed to practice as a dentist. There are over 56 dental schools in the United States that are accredited by the American Dental Association (ADA). Dental schools require a minimum pre-requisite of 2 years at college prior to admission into an accredited orthodontic program.