Underarm waxing is one of the most popular hair removal choices for women across the UK — and it’s easy to understand why. Compared to shaving, it delivers silky smooth results that last for weeks, and with regular sessions, the hair often grows back finer and sparser over time. But whether you’re booking your very first appointment or you’re a seasoned waxing regular, knowing how to prepare for underarm waxing properly makes an enormous difference to both your comfort and your results.

A little thought in the days leading up to your session can reduce discomfort, help the wax grip more effectively, and lower the risk of skin irritation afterwards. In this guide, the Glowroom team walks you through everything you need to do before your appointment — so you arrive informed, ready, and set up for the smoothest possible experience.

Why preparation matters more than you might think

The underarm area is one of the most sensitive regions on the body. The skin is thin, the hair follicles are densely packed, and the area is exposed to daily friction, sweat, and product build-up. All of these factors mean that going into a waxing appointment unprepared can have real consequences.

When the skin or hair isn’t properly ready, you may experience:

• Patchy results where the wax fails to grip shorter or coated hairs
• Heightened sensitivity or redness during the treatment
• A greater likelihood of ingrown hairs in the days that follow
• Mild skin reactions triggered by product residue or over-sensitised skin

The good news is that all of these issues are largely preventable. With the right preparation routine, your therapist has the best possible conditions to work with — and your skin is set up to respond beautifully.

Getting the hair length exactly right

One of the most frequently asked questions ahead of a waxing appointment is about hair length — and it’s genuinely one of the most important factors to get right. Hair that is too short won’t bond with the wax, and hair that is too long can make the session more uncomfortable than it needs to be.

The sweet spot is between 5mm and 8mm — roughly the size of a small grain of rice, or around two to three weeks of growth after your last shave.

Here’s what to bear in mind:

• If the hair is shorter than 5mm, the wax won’t be able to grip it properly and results will be uneven
• If the hair is longer than 10mm, consider trimming it down to around 6–7mm before your appointment
• Never shave in the two to three weeks leading up to your session — shaving cuts the hair at the surface, which resets the growth cycle and makes it far harder for the wax to remove hair from the root
• If you’re transitioning from shaving to waxing for the first time, allow at least three to four weeks of growth before your first appointment

It can feel tempting to shave during that waiting period — but resisting the urge is genuinely worth it for the quality of your results.

Exfoliating and prepping your skin

Gentle exfoliation is one of the most effective things you can do before a waxing appointment, yet it’s a step that many people overlook entirely. Exfoliating 24 to 48 hours before your session helps to lift away the layer of dead skin cells that can sit on the surface and prevent the wax from adhering cleanly to the hair.

Here’s how to do it effectively and safely:

• Use a gentle body scrub or a soft exfoliating mitt — not a harsh physical scrub, as the underarm skin is delicate
• Work in light circular motions, then rinse thoroughly and pat dry
• Do not exfoliate on the morning of your appointment, as this can temporarily sensitise the skin and make the treatment more uncomfortable
• After exfoliating, keep the skin clean and product-free in the hours before your session

According to the British Association of Beauty Therapy & Cosmetology (BABTAC), proper skin preparation before professional waxing is a key factor in achieving thorough hair removal and reducing the risk of post-treatment skin reactions — making this step one that professional therapists consistently recommend.

On the day of your appointment, arrive with clean, dry underarms and no products applied. This simple step makes a more significant difference than most clients expect.

What to avoid in the 48 hours before your appointment

Knowing what not to do before underarm waxing is just as valuable as knowing what you should. Certain habits and products can actively work against the treatment, either by coating the skin, heightening sensitivity, or interfering with how the wax bonds to the hair.

In the 48 hours before your waxing session, avoid the following:

• Deodorant and antiperspirant — do not apply these on the day of your appointment, as they create a film over the skin that reduces wax adhesion
• Moisturisers and body oils — these have the same effect, preventing the wax from gripping the hair shaft cleanly
• Perfumes and body sprays — fragrance and alcohol-based products can irritate freshly treated skin
• Caffeine and alcohol — both can temporarily constrict the pores and increase overall skin sensitivity, making the treatment feel more intense
• Sunbathing, sunbeds, or prolonged UV exposure — sun-exposed skin is significantly more reactive and prone to lifting during waxing
• Intense exercise immediately beforehand — sweating can leave residue on the skin and cause pores to become temporarily more sensitive

If you use prescription-strength topical retinoids, strong exfoliating acids such as AHAs or BHAs, or any other active skincare ingredients, always let your therapist know before your treatment begins. As outlined in NHS guidance on hair removal, certain skincare products can thin the skin’s surface layer, making it more vulnerable during treatments such as waxing — and your therapist will be able to advise accordingly.

How to manage discomfort on the day

For many people, the anticipation of discomfort is the biggest barrier to booking a waxing appointment. The underarm area can be sensitive, but there are several practical steps you can take to make the experience far more manageable.

• Take a mild over-the-counter pain reliever such as ibuprofen around 30 to 45 minutes before your appointment if you know you’re particularly sensitive — always follow the recommended dosage
• Time your appointment thoughtfully — try to avoid booking in the week before or during your period, as hormonal changes during this time can temporarily heighten skin sensitivity across the body
• Shower beforehand — a warm shower gently opens the pores and softens the hair follicle, both of which make removal smoother and more comfortable
• Wear the right clothing — choose a loose-fitting, breathable top on the day of your appointment to avoid unnecessary friction on freshly waxed skin
• Breathe steadily during the treatment — physical tension causes the body to contract, which can make the sensation feel more intense. Slow, deliberate breathing really does help

At Glowroom, our therapists are trained to work with speed and precision, keeping discomfort to an absolute minimum. If at any point you feel uncertain or would like to pause, simply let your therapist know — we will always listen.

If you’re planning a more extensive session, such as full body waxing, many of these same preparation steps apply across all areas of the body, so it’s well worth building them into your regular pre-appointment routine.

Frequently asked questions

Q: How long should underarm hair be before waxing? A: The ideal length is between 5mm and 8mm — roughly equivalent to two to three weeks of growth after shaving. Hair shorter than 5mm won’t bond with the wax effectively, while hair longer than 10mm can be trimmed slightly before your appointment. Getting this right is one of the single most important factors in achieving clean, thorough results.

Q: Can I shave before my underarm waxing appointment? A: No — shaving before your appointment is not recommended. Shaving cuts the hair at the surface rather than the root, leaving it too short for the wax to grip and disrupting the natural growth cycle. You should avoid shaving for at least two to three weeks before your session. If you’re new to waxing, allow three to four weeks of growth after your last shave before booking.

Q: Should I exfoliate before underarm waxing? A: Yes — gentle exfoliation 24 to 48 hours before your appointment is highly beneficial. It removes dead skin cells that can interfere with wax adhesion and helps reduce the risk of ingrown hairs afterwards. Avoid exfoliating on the actual day of your appointment, as this can leave the skin temporarily sensitised.

Q: Can I wear deodorant before my appointment? A: It’s best not to apply deodorant or antiperspirant on the day of your waxing session. These products coat the skin and reduce the wax’s ability to grip the hair. If you’d like to feel fresh before arriving, simply shower and leave the underarm area clean and product-free.

Q: How can I reduce pain during underarm waxing? A: A mild over-the-counter pain reliever taken 30 to 45 minutes beforehand can help significantly. Booking away from your menstrual cycle, warming the skin with a shower beforehand, and practising steady breathing during the treatment all make a genuine difference. A skilled therapist working efficiently is also one of the most effective ways to keep any discomfort brief and manageable.

Q: How often should I get underarm waxing done? A: Most clients find that results last between three and four weeks before regrowth becomes noticeable. With regular appointments, many people notice that the hair gradually grows back finer and more sparse, making each session more comfortable than the previous one.

Conclusion

Knowing how to prepare for underarm waxing is the foundation of a genuinely great treatment. From growing your hair to the right length and exfoliating gently beforehand, to arriving product-free and booking at the right time of the month — each step contributes to a smoother, more comfortable experience and results that last. Preparation isn’t a chore; it’s a small investment that pays off from the moment your appointment begins.

At Glowroom, our therapists are here to support you at every stage, offering expert guidance and a warm, welcoming environment designed around your wellbeing. Whether it’s your first time or you’re returning for regular maintenance, you deserve a waxing experience that feels as good as it looks.

Ready to experience professional underarm waxing at a premium UK spa? Book your appointment at Glowroom today → https://glowroom.uk/schedule-appointment/