The amount of time you should keep your pillow depends on the kind of material your pillow is made of. People tend to keep pillows for too long, and this could lead to lasting pain and even nerve damage in your neck. Some people recommend replacing your pillow every six months. This is necessary if you buy cheap pillows that degrade quickly And doubly true if the pillow isn’t washable.
Higher quality washable pillows and hypoallergenic pillows with washable covers can last a lot longer as evinced by warranties that last up to five years on high quality pillows.
It is a personal decision. If you don’t mind adjusting to a new pillow frequently, you can probably opt for cheap pillows. If your pillow becomes precious to you (for example, you take it with you when you travel because you sleep better on your pillow), you’ll enjoy one that will form a lasting relationship. But pillows, like pets, won’t last as long as we do no matter how much we love them. If you’ve been using the same pillow for years, it’s time to get a new one.