20 things you should never say to a woman after she's changed her hair.

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There is nothing worse than spending a day (and a cringeworthy amount of money) at the hairdresser only to be greeted by a less than enthusiastic reception when you debut your new ‘do.

Related: Good bye balayage. Everyone’s getting tortoiseshell hair now.

A quick poll of the The Glow office demonstrated just how devastating the wrong response can be with many of us on the receiving end of some less than mood-boosting reactions to new hair styles.

We think you’ll be able to agree with us that these 20 things should never be uttered to a woman post-chop or dye…

It seems that while some of us are clear on the social rules of how to respond to a friend after a big hair change (Read: even if you hate it just say something nice!) other people need a little educating.

Related: 4 things your hairdresser really, really wants you to stop doing