Women should change their underwear at least once a year. This is the advice given by experts and as a reason list some.

A doctor has shed light on the amount of bacteria that can be found in underwear and honestly this can make you throw away all old underwear.

When it comes to the drawers where you keep your underwear, many of us also have those pairs which are faded by washing, but are comfortable, so we do not dare to separate from them. And no matter what and why, we just can’t part with them yet.

But according to a hygiene expert, we need to get rid of underwear we have had for more than six months and replace it with new ones.

Intimate health specialist, Dr. Shirin Lakhani, explained how the bacteria can stay inside even after they have passed in the washing machine, even after some washing.

Speaking about "Tyla", she said: " The underwear is in close contact with the skin, more precisely with the intimate areas for extended periods of time. As a result, they also come in contact with the dead skin from those areas, as well as with bacteria - both healthy bacteria that everyone has, as well as bad bacteria, which can be the result of infections that can even lead to SST (sexually transmitted diseases) ".

" There is some research that suggests that even washing underwear in the washing machine can not completely remove some bacteria like E.coli. "

So, according to experts, the best advice is to change old underwear with the purchase of new ones " at least once a year".

As for the underwear that is worn more often, in activities such as gyms, she recommends that you " throw it away " more often.