If your dad is a brain sugern, I'd listen to him. If hes not, he doesnt know what hes talking about. I HIGHLY duobt they would release if it there was long term affects on anyone.
hmmm
maybe like
it messes with your brain
and changing the frequency maybe can be dangeruose
but from what i have heard its all safe
so i will continue to use it
^.^
These sounds are absolutely not dangerous. When you brain frequency is changed it will go back to its normal frequency. And that usually takes 10 minutes to 2 hours. No chemicals, no physical effects.
And that 14 year old thing, its not true. So just go for it. It will be all fine.