I attempted it 2 weeks ago. My lips didn't necessarily improve a whole bunch but could see the general health benefits of it. I wouldn't let a child do it. I'm 19 and struggled with it after 36 hours. The food cravings and awful breath were two of my main problems. But thats only because I had to get up and go do things. If your child can get complete rest without having to do anything else, than I guess you can gauge how he handles it. For myself I was wondering what would be more efficient and effective, a Water Fast or liver flush.