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This product is a very unique type of dental floss. It is called Oral Finish Thin and Strong Floss. Usually, people use the kind where you pull the thread out, but this one has the thread kept taut like that. I found it convenient that there was no hassle of pulling out and cutting the thread.
It is pulled really tight, so you just need to move your hand. Sometimes it is difficult to move it against the back of your teeth when using dental floss, but since this one only requires you to hold the handle, it is convenient. There are 50 pieces in one pack.