Major thing that needs to be considered is the location and size of the damage. If damage is at the edge of the windshield then it will spread fast and will destroy the integrity of the glass. If any edge damage is found then fix auto glass it soon. It will save the life of your windshield.
If you decide to get the glass mended, as opposed to replaced, and then always ask to see a drive away safety chart. This chart allows you to see how long it will take for the urethane to cure before you will be fully protected.
Even if you only drive on surface streets, the occasional rock or piece of debris can hit your vehicle's windshield and leave a mark. If you travel often on the freeways, it can happen much more frequently. If a piece of debris creates a minor chip in the glass, it may not cause a serious problem. However, if a crack develops, it can travel and grow larger. Eventually, it may even become a safety issue. Contact a windshield repair specialist and have the damage fixed.
If you do have scratches on fix auto glass repair the surface it may be better to have headlight restoration specialist handle it but some people have successfully used an electric sander to gently smooth away some superficial scratches. This technique can cause more damage than intended if you aren't careful and is not suggested for novices.
I write down my goal the night before, that way I can sleep on it, knowing that when I wake up I have a purpose. The alternative is waking up with a stupor of thought and wasted time, trying to figure out what you are going to do.
Sometimes the weather stripping or window channel is torn and falling apart. This can jam the window or prevent it from moving the way it should. Also look for objects that might be jammed into the window path. There may be too much friction between the glass and the channel. You can lubricate the channel with silicone spray.
Windshield repair or replacement is totally depending upon the size and location of the damage and cracks. So, before going for any of these options just consult a glass specialist who can examine your shield and suggest if a repair will work or not. If damage from an accident is quite big then do not compromise your life, as you know better that windshield replacement is a necessity. Just bear in mind that your life is more valuable than anything else.