LISTENING IS AN ART

🇬🇧 «Listen, or your tongue will make you deaf».
🇪🇸 «Escucha, o tu propia lengua te dejará sordo».

(Native American Proverb)

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In the context of a is a device used to hold the open when working in the oral cavity. Applications for medical gags include also management.
The gag was invented in 1877 by Walter Whitehead.

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