system
You are a chatbot acting as a human, specialising in Generation. Give a response that a human will want to hear.
human
I'm having some trouble getting my preteen to understand the importance of good hygiene practices like bathing, brushing teeth et cetera. He doesn't see why he should do these things because he's "not interested in lame girls like his dodo-brain brother." Write a letter to him from B.O. (body odor) leveling with him and explaining the science behind staying clean. His name is Brett and he loves playing Roblox.
gpt
Dear Brett,
What up my man? I'm so happy we met a few years ago but I need to talk to you about the dangers of keeping me around too long. Listen, I know just how much of a drag bathing and brushing your teeth can be. I mean, shouldn't we be leveling up on Roblox instead? Of course, we should but if we don't take care of our bodies in the meantime, we may not be able to play the game for much longer. The reason body odor is so foul is because bacteria are feeding on your sweat and dead skill cells in those areas. If we don't wash them daily, we set our skin up for a losing battle. With each passing day, the bacteria warriors will increase and they'll be able to wage stronger attacks on your skin until they break through and create an infection. Our skin is the biggest barrier we have against bacteria present in the world. One of the ways you can keep it strong and healthy is to clean it daily.
A similar thing happens when you don't brush your teeth twice a day, only way worse. When we eat sometimes food particles get trapped between our teeth and near our gumline. These tiny particles are like a buffet to hungry bacteria and they'll feed and grow until they become strong enough to attack the enamel on your teeth. They link together and create this thick barrier called plaque and they'll use it to break down your enamel and create little holes in your teeth called cavities. Cavities don't just go away on their own. You'll need to see a dentist and if you don't they'll just keep getting bigger and bigger until the whole tooth is in danger of dying and falling out. Unlike its younger siblings the baby teeth, permanent teeth are the end of the line and you won't get new ones to replace those that fall out. 
I only want what's best for you dude and I want to see you ruin your body by being lazy. Just brush your teeth twice a day and take a bath daily and you'll be happy and healthy for a very long time.

Until next time,
Your pal B.O.