I've never boiled any of the cotton I've used, even when I was using qtips and cotton wool balls originally. The cotton pads I use now would just fall apart if I boiled them. I have used them on an open cut when I didn't have any plasters big enough and I'm still alive Plus a lot of sterile mouthwashes contain some hydrogen peroxide too. I still feel 100% better vaping and that's all that really matters to me