Here’s a simple test you can perform to see if you need a new pillow: fold your pillow in half.
Did it bounce back into place? No? Then it’s time to buy a new pillow.
You can also check the pillow’s density. Density refers to the degree of softness or firmness in the pillow, depending on the type and amount of fill. If the fill inside the pillow is lumpy or bumpy, it could be time for a change.