I've tried a couple of different versions of intradental brushes, and while they were effective in cleaning, the wire cores that hold the bristles could be harsh on the gums, especially when trying to reach in between the rear molars. The RAZOKO brushes are all plastic, and are more gentle on the gums. While their lack of stiffness makes it a little more challenging to insert them in the aft molars, a little finesse gets them into place, and they don't poke the gums while you're trying to insert them. They do a good job of cleaning, and I like the fact that they are so inexpensive that I can dispose of them rather than trying to clean them for re-use. A box of 300 sells on Amazon for about the same price as a box of 30 of the wire and bristle type sell at the drug store. I recommend these and plan to purchase them again.