Invisalign is a relatively new way to straighten teeth without the traditional appearance of braces.
Using a series of clear trays that are changed approximately every two weeks, teeth are moved and shifted as needed. No metal brackets or wires are needed making them virtually invisible.
One of the most remarkable aspects is that the trays easily come out of the mouth enabling you to brush and floss like normal, unlike traditional braces that are difficult to brush around, impossible to floss, and usually requires the use of a Waterpik, or something similar, to effectively clean between the teeth.
Quite often, before traditional braces are removed, there are some gum problems just from the lack of ability to keep the teeth and gums clean.
Another consideration to Invisalign is how much straightening needs to be done to your teeth. Invisalign is not for everyone. If you have teeth that need to be significantly moved in order to be straight, this may not be an immediate option for you. It could be an option at a later date, however. Also, if you have a bad overbite or underbite, Invisalign may not be able to help you with that. You will have to have other appliances used to correct such problems that cannot be used with Invisalign.