Scientifically, no. Your body produces enough to fill your testicles, and when the semen dies, it is excreted from your body along with your urine. You're totally safe.
all it does is makes it so your balls never feel uncomfortable due to semen build up. you're not gonna die or anything, it just might become slightly painful
I masterbate a good 3 times a day tbh. Once in the morning, once when I return home, and once laying on my bed at night. If I get horny during the school day I'll just blow a load in the bathroom really quick.