Looks like plastic floss coated with a so-called "spongy" material. Yes, it's easy to insert the thread in the right place, the problem is that the lint will detach from the needle threader and accumulate on either side of the area you want to comb. Then you cannot remove the floss from the area of the mouth where the floss was inserted due to the amount of lint. I literally had to take a pair of scissors and cut the thread to get it out of my mouth. I am giving this product one star based on my one time review of the product. I suppose if I don't even want to try doing it again, it must be bad.
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