This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Retainers. took this picture of an Essixtype retainer The text in the background is from work with an expired copyright Hawley The Removable Retainer Exhibit in The First International Orthodontic Congress en SchuminWeb CommonsHelper Hanina en Hanina Original upload log page en Retainers Hanina bytes no took this picture