Has anyone seen more videos of bite blocks/mouth props and tongue guards being used, to keep the mouth open and to keep the patient from being able to close his or her mouth during procedures?
Example:
https://dereferer.me/?https://dereferer.me/?http://invisalignbracess.com/wp-content/uploads/2011/05/Cool-Braces-Color-Combinations.jpg
(I know this is a picture which has probably already been posted on here before, but just an example)

But also in the form:
https://dereferer.me/?https://dereferer.me/?http://practicon.com/product.aspx?id=51735
or
https://dereferer.me/?https://dereferer.me/?http://schudental.com/schudental/index.php?main_page=product_info&cPath=25&products_id=727
?