As you pointed out our main focus is the safety of the device, and creating something that may cause harm is not our intention. This is an area we are addressing, from our trials we have figured out that the thinner the "fluff" layer the less likely there is to be any degradation. We are also in the process of finding a liquid adhesive that best holds the "fluff" together but still allows its erasing properties to be used. Of course we intend to compare these two different solutions and determine the most effective one. Thank you for the question! If you have anymore feel free to ask.