Metric Space. A metric space is a set with a global distance function (the metric) that, for every two points in, gives the distance between them as a nonnegative real number. A metric space must also satisfy. 1. iff, 2. , 3. The triangle inequality.
PAYING FOR INVISALIGN TREATMENT. Many dental insurance plans cover Invisalign treatment just as they would other orthodontic treatments like metal braces. Plans may cover up to $3,500 of Invisalign treatment. Talk to your Invisalign-trained doctor or insurance provider to find out how much youâre covered for.
It's also recommended that you keep the same insurance plan during your entire orthodontic treatment. Most orthodontic coverage will not cover braces if they have already been applied to the teeth prior to the effective date of the policy.