(Note: the repair suggestion below is done at your own risk, and we cannot take any responsibility for the outcome. If you're all fingers and thumbs from bashing too many buttons over the years, don't attempt it!)
|Much like when you used to watch Blue Peter, you're going to have to gather a few household items together: a hard, small-headed toothbrush, a cloth and your DS.|
|Turn your DS on and tap the settings icon. It's at the bottom, in the middle. Tap the yellow icon on the far left. Tap the red squares to calibrate your screen then confirm.|
|If that hasn't helped we're going to have to get our hands dirty. Hold your DS vertically, as shown in the picture and grab your toothbrush.|
|Press down on the touchscreen to make a gap between it and the plastic border. You need to be careful here, the DS is pretty resilient but it will be possible to break it if you exert too much pressure. You only need enough space to get a couple of the brustles of your toothbrush in.|
Work your way around the whole of the touchscreen border with the toothbrush. You'll need to move where you're applying pressure. You probably won't notice any dirt coming out and it'll feel a bit unsatisfying but it is working, it's just that the screen's really sensitive and a tiny bit of dust could have caused the problem. When you're finished, repeat the calibration procedure.
|A good way to test if it's worked is with Pictochat. Try to colour the whole screen in black and, if the cleaning has worked, you should be able to do it in not too long. If it's still not working after you repeat steps three to five, consider replacing your DS.|
Pocket Gamer will also not be held responsible for any dental work required should you ruin your toothbrush.
Don't miss our other DS How Tos.