I’ve been using a mouthguard almost 24 hours a day for about 13 days. I feel like the masseter muscle—the one on the side of the jaw—looks more defined, and I’m not sure if this is a real effect or just a placebo. I also want to know if it’s normal that I barely feel anything now when I use the mouthguard. During the first two days I did feel pain in my teeth, especially when eating, but after the second day the pain decreased a lot. Today I felt a bit of discomfort again, although nothing compared to before, and it happened when I used my front teeth to pull on food.