You can blow into the shoulder button that is not working for a temporary fix. But if you want it to stay fixed you should use an air compressor & blow air into the shoulder button that is not working.
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The L and R buttons, also called the "shoulder buttons," are located on the back of the system on each corner; L on the left side, and R on the right. The location of these buttons are the same across all versions of the DS.
Send it in to nintendo for repairs
10-20
Nintendo invented the Nintendo DS and the Nintendo DS lite.
maybe people can push buttons from the Nintendo DS. like yyaba