MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Young boy with a dental retainer. A dental retainer is worn to straighten crooked teeth. The wires fit over the teeth, while the main body of the retainer sits in the roof of the mouth. A retainer may be used instead of fixed braces to correct a single tooth, or worn after the removal of a fixed brace to ensure the teeth do not move back to their original alignment.
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