Since we have some experience replacing screen covers on handhelds, we'll offer one warning. Unless you live in one of the clean rooms used to manufacture computer chips (and you don't, because it wouldn't be clean with people living in there!) you are going to get dust under your screen. This is a certainty unless you are profoundly lucky. Still, if you can't get Nintendo to fix your DS, a speck or two of dust is a small price to pay for a working touchscreen, although there's always the potential cost of completely wrecking your system.
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