i use a double because it forces me to keep my mouth closed. that way i wont get a broken jaw.
Really once you get used to wearing a double its not bad. the hole in the guard lets alot more air in then you think. and usually the guard is so big it opens up your lips a little so that there is never air restriction.
im glad you made this thread as i wanted to know the same thing, i was going to get the shockdoctor dna mouthguard, anyone ever used it before? i think it single but apparently it has extendable walls or something
for training/sparring? the double mouth guard is the way to go
almost anything that makes your training harder without hurting you gives you more improvement in less time. add to that that it protects you better than the single mouth guard
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