Dental retainers are an orthodontic apparatus that fits into the upper or lower part of the mouth and may or may not be removable. There are only a select few reasons why certain people may need to wear dental retainers. The primary reason people need dental retainers is as a reinforcement post-braces. In some cases, people with minor orthodontic problems may be fitted for a dental retainer instead of braces.

Most often, orthodontic patients who have worn braces for corrective alignment are fitted for dental retainers after their braces are removed. Dental retainers help reinforce the new position of the teeth while the bones and gums adjust to the new alignment. They prevent the shifting of teeth, which can happen as the mouth continues to grow or until the muscles in the mouth and jaw and the gums adapt to the new position of the teeth.

In the case of minor orthodontic issues, such as an over or under-bite, dental retainers alone may be able to correct the problem if properly worn. Usually when a patient is fitted for a dental retainer, they must wear it at all times for an initial period of time and then can revert to wearing it only at night. The actual instructions for proper use vary from patient to patient and are based on the opinion the orthodontist draws from dental x-rays and examination.

Very minor over- or under-bites can be corrected with dental retainers, but many dentists will only refer minor problems to an orthodontist if the patient is concerned with cosmetic appearance. Providing that the problem does not interfere with normal tooth development and function, the correction of the problem is left up to the patient. In the case of post-braces care, dental retainers are a necessary part of orthodontic and are essential for long-term success.

Dental retainers are a custom fitted appliance, usually made of molded plastic and wires. Only an orthodontist can fit patients for dental retainers. Before being fitted for a retainer, an orthodontist will determine and discuss with a patient the probable success in correcting any problem as well as instruct the patient on proper use and care.