Mouthguard Testers Survey Results
Hardly a statistically significant testing group, we had four racers in two different motorcycle road racing series testing three different models of Shock Doctor mouth guards. Four models of motorcycle helmet were involved in the test (Shark, Arai, HJC and Shoei) in sizes ranging from extra-small to medium. None of the testers had worn mouthguards for sports previously to this test.
Q ~ How did you find the 'boil and bite' fitting process?
Answers: process was straightforward and instructions manageable
Q ~ Do you feel that you got your mouthguard to fit your mouth well?
Answers: Some took two tries but all were happy with the resulting fit
Q ~ How would you describe the fit and feel of your mouthguard
Answers: Gel Max was a snug, comfortable fit for all four testers, two of three testers found the Ultra too rigid, and the two testers who tried the DNA model both found it comfortable.
Q ~ Is the mouthguard comfortable to wear without your helmet?
Answers: most testers found a mouthguard a bit intrusive at first, but generally comfortable to wear
Q ~ How does the mouthguard fit with your helmet on?
Answers: Gel Max was the model all testers could fit, although the tether didn't work out for some. The Ultra model fit well inside the helmet too. Although the DNA model fit comfortably neither tester found it worked well with a helmet, getting too crowded at the back of the mouth.
Q ~ Prefer tether or no tether?
Answers: 2 to 2 - two riders prefer tether, two don't - one tester performed track-side surgery to convert his to an untethered model and it took less than a minute.
Q ~ How did you find the mouthguard when you are riding on the track?
Answers: Some found it somewhat obtrusive at first, some were surprised at how comfortable they were. All four testers found they got used to it after a day or so of use.
Q ~ Do you feel safer wearing the mouthguard?
Answers: All four testers said yes
Q ~ Do you feel it's a worthwhile safety expense
Answers: All four testers felt the safety value returned on their minimal investment was worthwhile.
Q ~ Will you continue to wear a mouthguard on the track?
Answers: All four testers will continue to use a mouthguard
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In sports like football, soccer and hockey with the combined strength of large professional and amateur sporting associations research into safety equipment is much more extensive. Amateur associations in all three sports in most of North America have made mouthguards mandatory, as a result of their research into concussion prevention. One amateur football organization that had helmet rules in place for years, reduced concussions by 50% in a single year by making mouthguards mandatory.
Helmets are improving all the time, but there remain three ways to knock yourself unconscious inside your helmet; the impact of your brain with your skull, your brain suffering rotational forces (a greater risk for car racers actually) and the impact between your jaw and your skull. Only the third is preventable with safety equipment. 
After my initial research, one company seemed to emerge as an industry leader 'Shock Doctor', and provided a wide range of models. I discussed the idea with a few other racers and talked them into testing a few different mouthguards. Several of us (myself included) tested a model designed for car racers. I can only assume their helmets fit differently than a motorcycle helmet, since of the three riders who tested this model, none of us found it fit comfortably inside a motorcycle helmet. We're now testing two other models with moderate success, I've found both fit me well and are comfortable inside my helmet. After wearing both I think I have a slight preference for the comfort of the less-rigid model, but I might end up deciding I prefer the greater protection the more rigid model offers.
