Solution [2]

"Toothpaste huh? Well, all I can is that I never expected that to be your plan," Akumi said with a look of amusement on his face. 

"I agree, but it's not just any toothpaste. You must have noticed that the toothpaste in this world doesn't have any flavor, or well, instead it has a bad flavor right?" I said. 

"Yeah, it sucks."

"I was thinking of solving that problem," I stated. 

"Wait, I don't understand. Are you going to add flavor in the toothpaste now?" Akumi asked, clearly confused by my words. 

Honestly, I wouldn't blame him. The idea sounded so absurd on the paper that even I'd have the same reaction if I didn't already knew about the impact it'll have. 

"You are right, I am going to do exactly that," I said. "The people of this world don't know that toothpastes are meant to have flavor since they have never used one like that, hence to them a flavorless or bad flavored toothpaste is the norm despite it being a pain.