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Hereof, can dead pixels come back to life?
Dead pixels are turned off and appear black on a white surface and are not visible on a black surface. Also dead pixels don't come back to life, only stuck pixels do. The ones that are stuck on a red, green or blue color. It may have been just a flaw with iOS8.
One may also ask, do stuck pixels go away? A stuck pixel is relatively solvable; dead pixels, in which none of the subpixels turns on, and hot pixels, in which all of them are on, are harder to fix. There are two things you can do to nudge your stuck pixel back to its proper behavior. Then turn the screen back on; the stuck pixel should be gone.
Consequently, can you fix dead pixels?
For Android, one of the better-rated pixel-fixing apps is Dead Pixels Test and Fix, available at the Google Play Store. This app is free but it does contain ads. Like other software methods of pixel fixing, it relies on flashing multi-colored screens to try and jolt the stuck or dead pixels back to life.
Is one dead pixel a big deal?
IMO, a dead pixel is like a stone chip on a windshield - on a brand new "off the lot" vehicle. If the stone chip in either corner, no big deal. But when its "in the middle" of the windshield, one will see it every time. And, it will constantly remind them their "brand new" product is NOT perfect.