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Dr. Tung's Dental Floss
The floss is a bit on the thicker side, but it is incredibly soft when you use it.
It removes foreign substances really well, leaving my mouth feeling refreshed, and I am extremely satisfied with it.
After using this product, I found I couldn't use any other.
It's a bit on the expensive side, so I stock up when it's on sale.
Try using it once.