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An effective mouthguard is like a crash helmet for teeth and jaws. It also prevents the jaws coming together fully, thereby reducing the risk of jaw joint injuries and concussion. [ 1 ] A mouthguard is most often used to prevent injury in contact sports , as a treatment for bruxism or TMD , or as part of certain dental procedures, such as tooth ...
The mask was issued at 20 May 1915. [10] A more effective respirator that could last longer was needed; the hypo helmet was created in hopes it would replace the inferior respirator. Earlier versions of the gas mask prior to 1915s development of the small box respirator were crude and ineffective as no troops had yet experienced poison warfare.
mouth-bit respirators, which fit in the mouth with the nose pinched shut (escape only) quarter-mask or orinasal mask, covering the mouth and nose only; half-mask, from below the eyes to below the chin; fullface mask, from above the eyes to below the chin; Some elastomeric masks include one-way valves to let exhaled air out unfiltered.
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Safety glasses provide protection from external debris, and should provide side protection via a wrap-around design or side shields. [14] Goggles provide better protection than safety glasses, and are effective in preventing eye injury from chemical splashes, impact, dusty environments and welding. [14]