There are three main kinds of retainers, all of which would typically be used after a patient has had braces, Invisalign, clear aligners or any other orthodontic treatment  for several months:

Hawley Retainers

Traditional retainers that are made up of plastic or acrylic and wire, sculpted to the contours of your mouth.

Clear or “Essix” retainers

Molded in plastic. They resemble Clear Aligners.

Permanent retainers

Sometimes referred to as “bonded” or “fixed” retainers, these retainers are permanently attached to the back of the front teeth. And many patients prefer them because they are effective and cannot be seen.