“…There is considerable debate about how the use of mouthguards affects an athlete's performance [ [11] , [12] , [13] , [14] ]. Some research that includes clinical studies and meta-analyses shows that personalized MTs do not negatively affect the athlete's performance, and in some cases their performance even improves [ [15] , [16] , [17] , [18] , [19] , [20] , [21] , [22] , [23] , [24] , [25] , [26] ]. However, other authors have reported on athletes who have stopped using MTs due to discomfort when wearing them, and who have experienced difficulties in breathing, speaking, and drinking [ [27] , [28] , [29] ].…”