Most of the time, of course, we neglect to do it at the right time. Changing personal items such as pillows and toothbrushes is essential for good hygiene and should be done more regularly than we might think.
So when it comes to the pillow we sleep on, there are many who not only keep it for years, but do not wash it often. Experts, however, report that pillows made of non-washable materials, as shown on the labels, have an expiration date and must be replaced every year.
Sleeping on used pillows full of dust and mites can cause pimples, eczema, allergies or even worsen asthma attacks.
Source: baby.gr