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.
FSAFEDS allows reimbursement for pre-paid orthodontia expenses, up to the elected amount, regardless of. the date of service. The payment must have been made during the benefit period. If there is coverage under. any dental plan, payment from a Health Care Flexible Spending Account (HCFSA) or a Limited Expense.