A fixed retainer is a dental device used to maintain the position of teeth after orthodontic treatment, such as braces. It consists of a thin wire that is bonded to the back of the teeth, preventing them from shifting back to their original positions. Fixed retainers are often used for the lower front teeth, where movement is more likely. Unlike removable retainers, fixed retainers are not taken out by the patient, making them a convenient option for long-term stability. Regular dental check-ups are important to ensure the retainer remains in good condition and to monitor the health of the surrounding gums and teeth.