Today’s invention is for athletes who have to wear mouthguards.
When breathing heavily, I find it can be hard to get air through one’s mouth with teeth clenched. Relieve the pressure on the guard to take in oxygen and someone is sure to plant a gloved hand in your laughing gear.
To avoid this, I envisage a gumshield with external vents…a little like jet engine intakes.
The wearer can suck air more easily through these (since they also hold the cheeks clear of the teeth) and around the back of the guard to the throat.