This article explains how any protection is better than no protection it’s the same as riding a motorbike you can put a construction site helmet or even a bucket on your head and that will be a protection, just not as good as proper motorcycle helmet.
In my experience I see a lot of teeth being damaged because person was using not a proper mouth guard, people try to save money and get chipper stock mouth guard from a chemist and then end up paying for expensive crown and bridge work.
I have made thousands of mouth guards for people of all ages who play different sport. Every time I issue a mouth guard to a patient who never had custom fitted mouth guard before ,but instead has been using the one from a chemist I hear a comment “ohh this is much better and more comfortable WOW!”
For this reason clients should think twice of the consequences of not getting proper mouth guard for themselves or their children because an injury will be painful and more expensive. However If a patient has a health fund, then then it probably will cover most of the cost, and the gap payment would be similar to a cost of a stock mouth guard from a chemist. This is something to consider when thinking about your oral health.