If you've restored your headlights once, you might be wondering whether doing it again — and again over the years — eventually wears the lens out. Here's what actually happens to the lens material over repeated restorations, and when repeated treatment stops being the right approach.

Every car's headlights eventually turn yellow — but most drivers never learn why, or that it can be reversed. This guide explains exactly what causes headlight yellowing at a chemical level, why it happens to every vehicle eventually, and what actually fixes it for good.