Olivia Colman and Lisa Bonet are among the stars going silver – but workplace ageism means many women still fear ditching the dye

To dye, or not to dye. That is the decision many people, particularly women, face when their hair starts to grey.

This week Olivia Colman joined the growing ranks of women embracing grey hair and ditching the dye. Appearing at Zurich film festival, Colman had swapped her dark signature pixie cut for a grey, curly mane swept to one side.

Experts don’t know exactly what causes dandruff, but if you’re seeing light flakes on your scalp, over-the-counter products can help

You spy a scatter of white flakes on your collar. Or you’ve got an itch that won’t quit, no matter how much you wash your hair. Dandruff isn’t glamorous, but it’s common: about half the world’s population has it.

An itchy, flaking scalp is rarely dangerous, but it can be annoying. Here’s what you need to know about what might be causing your flakes, what you can do about it, and when it’s time to get help.

Mineral deposits can accumulate, making hair drier, but removing them can cause different problems

From hair treatments to shower filters, a wave of products have been launched promising to protect hair from the “problems” caused by living in a hard-water area. But are they really necessary? “Hard water has a higher concentration of dissolved minerals, especially calcium and magnesium,” says Desmond Tobin, professor of dermatological science at University College Dublin. “These are naturally occurring in water, particularly water that is not rainwater.”

When water moves through soil and rocks, such as limestone, minerals dissolve into it and remain there when it comes out of your tap. These minerals are responsible for the limescale that builds up in your kettle.

From bowl cuts to extreme mullets, punk dos to bad dye jobs, a terrible hairstyle can never be forgotten – even decades after it has grown out

It’s the late 1990s. Big, round, feathered fringes are a huge deal at my primary school. Most of my friends have one, influenced by Britney Spears or Emma Bunton. I, too, have a fringe. Mine, as you can see, appears more inspired by Kevin Keegan circa 1993.

A good scalp cleanse can be useful, but it partly depends where you live

We’re experiencing the “skinification” of the scalp, says Desmond Tobin, professor of dermatological science at University College Dublin. After decades of consumer obsession with improving the quality of facial skin, attention is now being turned to our heads.

A wave of products have launched – from scalp scrubs and acid exfoliants to deep-cleaning shampoos – claiming to “detox” the scalp and promising everything from shinier hair to boosted growth.

Every time I get my hair done, I find myself confronted with rising costs, and dizzyingly long maintenance regimes

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This week, I tried to book in for some knotless braids at the last minute. I knew I was going to be writing about how the simple pleasure of getting a head of box braids is starting to feel increasingly complicated, and thought that it would be good to get some pictures of the process. Then, I found myself getting wound up as the subject of this newsletter began to play out on a sort of meta-level.

When I decided to get my hair done for this piece, I knew that booking a next-day braiding slot would prove to be a kafkaesque task. My usual place asks that you schedule around a month in advance. My second option says that we’d need a “private room” to bring a photographer, bumping the bill up to £600. While trying to write an immersive report on the difficulties that come with getting braids, I suddenly realise that I am living the report.

From serums to hand soap, fragrances to hair stylers, here are the beauty buys that justify the price tag and the ones you can happily get on a budget

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Walk down any beauty aisle, and you’ll be told every product is essential, transformative and worth hocking a kidney for. For every £300 miracle cream that claims to somehow change your entire facial structure, however, there’s someone – usually on social media – insisting you can buy a perfect dupe of a cult luxury fragrance. It can feel bewildering.

After more than 15 years working in the industry – and testing hundreds of products a year – I can confirm that beauty is rarely as simple as luxury v high street. But there are a few insider realities about how beauty products are made, priced and marketed that are worth knowing before you decide which are worth the spend – and which ones aren’t.

Teaching body positivity is one thing. Helping a child navigate social pressure – while preserving agency – is another

Hi Ugly,

My nine-year-old daughter has become aware that she has a moustache. (I’m a hairy Italian, this is her birthright.) It’s more noticeable than anything her friends have, and visible in pictures.

Why is this column called ‘Ask Ugly’?

How do I respond to my friends when they criticize their own weight and looks?

How should I be styling my pubic hair?

How do I deal with imperfection?

There are many online techniques for self-cutting a fringe – but would I end up looking like Uma Thurman in Pulp Fiction or a low-budget Grimes?

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I have had a fringe since I was 15 years old. I will never forget this life-altering haircut. For years before it I had been suffering lingering effects from a bob cut I received unwillingly in primary school.

You were not a cool person if you had a bob as an adolescent in the early 2000s. But finally, my hair had grown sufficiently for styling, and I got it cut to sit neatly on my shoulders with front bangs.

Steven uses a mousse to prevent his hair thinning, but Mabel thinks it’s risky for their cat and dog. Whose argument contains a strand of truth?

• Find out how to get a disagreement settled or become a juror

The mousse he uses puts our animals at risk. I would like him to switch treatments

I’m really careful with the cream and always keep it away from our pets. Plus, it works

From schools in Ghana to workplaces in Britain, underpinned by the colonial roots of ‘respectability’, conversations around natural hairstyle persist

Last month a Jamaican woman said her teenage son had been pulled from lessons because school staff had deemed his afro hairstyle inappropriate.

“The dean of discipline called me to state that my son has been removed,” Michelle Scott said. “You’re telling me that you took him, a fifth-form student, out of classes to go and get a haircut?”

Hair transplants have never been more widespread or more affordable. So why do so many balding men prefer glued-on hairpieces? And are the best really undetectable?

When you hear the word toupee, certain images spring to mind. Older men with suspiciously thick hair, say; or a poorly colour-matched partial wig covering a bald patch, perhaps flying off in the wind. These are the toupees of old.

Toupees are distinct from wigs in that they cover only part of the scalp, but both have a long history. While humans were wearing hairpieces as far back as ancient Egypt, toupees originated in the 18th century, the name developing from the French toupet, meaning “tuft of hair”. They became particularly prominent in the mid-20th century, with Time magazine estimating that more than 2.5 million men across the US were wearing toupees by 1970. But concerns about how obvious the pieces were, hammered home by ridicule in popular culture (see Monty Python’s Toupee Department sketch) combined with the gradual acceptance of shaved heads in fashion, led to their decline.

If plucking made more hairs grow, it would be the solution to thinning, but sadly it can have the opposite effect

‘I wish that by plucking a single hair you would get more to grow back,” says Desmond Tobin, professor of dermatological science at University College Dublin. “It would be a great solution for people who are thinning and unhappy about it.”

Unfortunately, it’s a myth. Our scalp is covered in follicles – essentially tiny hair factories – and each one produces just a single hair shaft. Plucking a hair won’t cause multiple hairs to grow from the same follicle.

I was surprised by the dormant ringlets springing to life as I hunched over the basin, squishing in conditioner to define each tendril

• Read more summer essentials

My housemate has a special phrase for some of my old photos: “Ima’s whiteface era” – hair seared straight down the middle with brassy blond highlights.

Where I grew up, in a regional coastal town, the gold standard was sandy blond beach babe.