I got mine from Meyarn for $14.99. But it comes with a hundred of them. They come in different sizes as far as spacing. Meyarn has 5 sizes to choose: 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm and 1.2mm. You can get the ones that can fit into tight spaces between tight teeth. They are good for places that the regular toothbrushes cannot go. Sometimes I will put a little toothpaste on it and go in between as well.
These are a lifesaver! When you get food stuck in your brackets, try to get it out and it doesnโt work, this is where these come in handy. These are really good. They’re very flexible and do not hurt at all. Highly recommend that you can get some.