Do mouthguards prevent concussion?

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Abstract
Mouthguards or “gum shields” were originally developed in 1890 by Woolf Krause, a London dentist, as a means of protecting boxers from lip lacerations. Such injuries were a common and often disabling accompaniment of boxing contests in that era.1–3 These gum shields were originally made from gutta percha and were held in place by clenching the teeth. Philip Krause, his son, who was both a dentist and amateur boxer, subsequently refined the design of the gum shield and made them from vella rubber.1 In the United States, the first mouthguard was probably manufactured by Thomas Carlos, a Chicago dentist, in 1916.1, 4