Does anyone really know how dangerous some of these flea "remedies" really are?

I see people all the time that answer questions that they don't really know the answer too. I try to check the questions daily to correct these stupid people. I am a certified Veterinary technicion and the only things that I find safe are Advantage and Frontline. I will only recommend those to people. I have seen the results when people use over the counter drops and those other products.