This thread works well. I can't say charcoal has a significant effect; maybe it depends on how discolored your teeth are. How dental floss works well. It won't snap or tear like some cheap threads. The floss slides between my teeth fairly easily and has some texture which I think helps it clean better. The mint flavor is less strong than the well-known brands, but I don't smell charcoal either. 4 stars because the price is high compared to famous American threads, which also suits me.
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