Instead of buying new retainers, can i just use invisalign?

The last aligner: The last aligner in the series is a retainer. Yes you can.

Yes, temporarily: You may use the last aligner as a retainer but generally not strong enough to last. A fixed lower retainer works well just harder to floss teeth. Removable retainers are effective and long lasting. They clip onto your teeth and sit on your palate or behind your tongue. Many versions. Invisalign recommends their own retainer system(vivera) which will send you new ones over time.

Sure: Sure you can, but the cost of invisalign is much more than a simple retainer.

Why?: I am assuming that you need new orthodontic retainers because they are lost or broken. Invisalign is method of orthodontic treatment to move teeth. If you do not need orthodontic correction, then you only need retainers and there are many different types (including invisalign's vivera retainers). Ask your orthodontic specialist what is best for you.

Yes : The nice thing about invisalign retainers is that you will get 4 for the upper and 4 for the lowers jaw. They are called viveras. No big deal if you lose one or two. This set should last you about 5-7 years. They generally cost less to fabricate than traditional retainers because a computer makes them verses hand made by a lab technician. In my office it it the retainer of choice.

Yes: Invisalign makes a series of 5 or 10 aligners for minor relapse. If your teeth are straight, invisalign makes a durable aligner to act as a retainer. A regular retainer is much less expensive though.

Depends: Invisalign trays are somewhat elastic, and only designed to work for a few weeks. Retainers, including Invisalign retainers, are more rigid, designed to hold teeth in place rather than move them. Best advice: see a fully qualified Orthodontic Specialist.