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Due to my age, my gums are weak, and if I don't use an interdental brush regularly, food inevitably gets stuck between my teeth because they are widely spaced.
My dentist told me to make sure to use interdental brushes, so I bought one from Daiso and I'm quite satisfied with it.
10 for 2,000 won is cheap, right? Haha. But you shouldn't compare it to dental products; it's just decent enough to use.
It works well. If you're looking for a decent product, this is a good choice.