Does shampoo and conditioner actually expire, or is that a myth? Shampoo and conditioner can actually expire. It's generally good for 2-3 years once opened and 3-4 years unopened.

Is it OK to use expired shampoo and conditioner?

Should you end up using expired shampoo and conditioner, it's highly unlikely that it will be toxic for your scalp, but you could develop an infection or dry scalp with prolonged use of expired shampoo. It won't damage your hair or color, but if you have dyed hair, it could react to the chemicals in your hair dye.

Is it safe to use expired hair conditioner?

At the very least, expired shampoos and conditioners won't work the way they're supposed to. But, you can also run the risk of spreading bacteria onto your scalp, and opening the door for an infection.