In the old days, when your headlight burned out you just replaced the entire thing with a new glass bulb. Modern headlights are plastic assemblies, with a bulb inserted through the back. What this means, is that the plastic lens that light shines through never gets replaced, and eventually will begin to oxidize and deteriorate due to time, weather, and heat from your bulb. Today you will learn when it’s time to fix or replace your headlight assemblies, what options you have in doing so, and what the benefits are.