I've been using Sulcabrush for a year or two and the first bristles I bought were stiff, hard and thick packed and each lasted a long time - many months. The new ones I got are softer and less dense as if each had fewer bristles. And it feels like none of them will definitely last as long as the old ones I had. Apparently the manufacturer saves on quality. I will still use these - I bought 48 as they are great for my oral health but the quality has definitely gone down.
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