Few things are as disheartening as a client coming back after a week with gaps in her set. Before you change glue or technique, it’s worth working out what’s actually going on: eyelash extension retention depends on the biology of the natural lash, your prep, your technique, the adhesive and the room, and what the client does at home. This guide goes through each factor, what the sources say about it, and practical fixes.
Start here: the natural lash growth cycle
An extension only lasts as long as the natural lash it’s attached to. Like any hair, each lash goes through three phases: growth (anagen), regression (catagen) and rest (telogen). At the end of the resting phase the lash falls out and a new one starts growing in its place.
The exact figures vary between studies, and it’s worth knowing that:
| Measure | Thibaut et al., 2010 (British Journal of Dermatology) | Aumond and Bitton, 2018 (Journal of Optometry, review) |
|---|---|---|
| Growth phase duration | 34 ± 9 days | 4 to 10 weeks |
| Full cycle | 90 ± 5 days | 4 to 11 months |
| Growth rate | 0.12 mm per day on average | 0.12–0.14 mm per day |
| Number of lashes | — | 90–160 on the upper lid; 75–80 on the lower lid |
Bear in mind that the weekly follow-up in the Thibaut study involved just four volunteers, and that a more recent pilot study (Platt et al., 2021, also with a very small sample) found around 35% of follicles in the resting phase. Whatever the precise numbers, the practical takeaway is clear:
- At any moment, lashes are at different stages, so it’s normal to lose a few extensions every day along with their natural lash.
- Extensions last until the natural lash sheds, which is why the dermatology literature mentions infills every 2–4 weeks.
- Because each lash grows at its own pace, two lashes stuck together (poor isolation) end up pulling on each other.
Is it really an eyelash extension retention problem?
Before looking for fixes, play detective:
- Does the extension come out with its natural lash? That’s normal shedding. If it comes off on its own, without a natural lash, Divine Lashes describes that as a clear sign the bond has failed.
- When are they falling out? According to Divine Lashes, losing extensions within the first two days points to application or adhesive, not shedding.
- Is it one client or several? Lashbase suggests this filter: if it’s one client, look at her habits; if it’s several, check your own process, glue and room first.
Prep: cleansing and primer
Adhesive needs a clean surface. Oil, makeup residue, creams and even poorly rinsed cleanser all weaken the bond. Lashbase stresses rinsing lash shampoo off completely and leaving no trace of makeup.
When it comes to primer, sources disagree. Curacoro and Pure Spa Direct recommend it as a routine step to remove oil and residue; Lashbase, on the other hand, uses it sparingly and only on clients with oily lashes or skin, because overusing it can dry out the lash and hurt retention. If you use it, this is the order Curacoro suggests:
- Cleanse with lash shampoo, rinse and pat dry.
- Make sure the lashes are completely dry.
- Apply a small amount of primer with a microbrush, root to tip, keeping it off the waterline.
- Leave it for 30 seconds to a minute and wait until it’s fully dry before applying extensions.
- On infills, prime only the new natural lashes, not the existing bonds.
Pure Spa Direct warns that wet primer can react with the adhesive and spoil the bond. You’ll find primers in our glue and liquids section.
Technique: isolation, base and distance
This is the part that’s most in your hands. Lashbase gives some very specific placement guidelines:
- Distance from the lid: about 0.5 mm. Closer can irritate the follicle; much further leaves a gap where oil and dirt build up. Other industry guides say 0.5–1 mm.
- Contact area: at least 2 mm of the extension’s base bonded to the natural lash. Any less and the extension tends to pop off early.
- A well-seated base: “T-bar” bases (extension attached at a single point) and snags from poor isolation cause extensions to come loose when the client washes or brushes.
Other technical points that affect retention:
- Isolation: one extension per natural lash, separated from its neighbours. Lash Bee Pro recommends brushing through your work roughly every 15 minutes to catch stuck lashes or lifting bases. Good isolation tweezers make a real difference.
- Amount of glue: Divine Lashes says too little glue reduces retention; Lashbase warns against stretching a drop that has gone stringy.
- Glue speed: an adhesive that sets faster than you work will cure before the base is properly placed.
- Weight: Curacoro’s guide for classic sets is 0.10 mm for fine lashes, 0.15 mm for healthy lashes and 0.20 mm for strong lashes, and no more than 2–3 mm longer than the natural lash. Too much weight weakens the natural lash and can make it shed sooner. Choose the right diameter from our lash extensions.
Adhesive and environment
Cyanoacrylate cures with moisture in the air, so your room conditions directly affect the bond. Most manufacturers we checked recommend 40% to 60–70% relative humidity and around 20–24°C, but your adhesive’s data sheet has the final say. Also run through these questions from Lashbase:
- How long has the bottle been open, and where do you keep it?
- Does the room warm up through the day, or is the heating on all day?
- Are you leaving the drop on the jade stone for too long?
A hygrometer on your workstation (see our accessories) settles the question. Curacoro adds an interesting detail: when a client wears a face mask, her breath raises humidity and temperature around the lashes and speeds up curing.
Aftercare: what the client does at home
You can create a perfect set and lose it to poor aftercare. The most common advice across the sources we checked:
- First 24–48 hours: Lovely recommends avoiding water and steam for the first 24 hours (very hot showers, saunas, swimming). Lash Affair puts the full cure at 24–48 hours and advises avoiding water, steam, saunas and heavy sweating during that time.
- Daily cleansing with a gentle, oil-free cleanser (Lovely). Built-up oil weakens the bond.
- No oil-based makeup removers and no eye rubbing: according to the dermatology literature, both shorten the life of the bond.
- Night creams applied at least 30 minutes before bed so they don’t migrate onto the lashes, and watch out for shampoo and conditioner running down the face in the shower (Lashbase).
- Sleeping face down rubs the extensions against the pillow; Curacoro suggests a silk pillowcase or sleep mask.
- Brush daily with a clean spoolie.
- Never pull them off. The dermatology literature warns that pulling extensions can break the lash and even lead to traction alopecia.
Client factors outside your control
Lashbase lists hormonal changes, periods, pregnancy, breastfeeding, menopause, medication, illness and stress as factors that can affect retention; Curacoro adds that some medications increase skin oiliness. Several industry professionals also report periods of heavier shedding, which Curacoro places in spring and autumn (we found no clinical studies quantifying this). Ask about these changes at every consultation and note them on the client record.
Common technical mistakes and how to fix them
| Mistake | What it causes | Fix |
|---|---|---|
| Insufficient cleansing | Oil or residue that blocks adhesion | Lash shampoo, thorough rinse and, where appropriate, fully dried primer |
| T-bar base or less than 2 mm contact | Extension comes loose when washed or brushed | Seat the base along the natural lash |
| Poor isolation | Stuck lashes pulling on each other | Brush through and check roughly every 15 minutes |
| Extension too thick or too long | Excess weight and early shedding | Match diameter and length to the natural lash |
| Old or stringy glue drop | Weak bond | Change the drop frequently |
| Humidity out of range | Curing too fast or too slow | Hygrometer, then adjust the room or the glue |
| Aftercare not explained | Early exposure to water, oil or friction | Written instructions at the end of the appointment |
Health: when it isn’t a retention issue
Reactions such as eye redness, keratoconjunctivitis, allergic blepharitis and contact dermatitis have been reported in connection with extensions and their adhesives. If a client has intense itching, swelling, pain or redness, remove the extensions and advise her to see a healthcare professional. Many lash artists do a patch test with a few extensions 24–48 hours before the first appointment, although a clear result doesn’t guarantee a sensitivity won’t develop later.
Lash Canarias supplies mentioned in this guide
FAQs
Is it normal to lose extensions every day?
Yes, as long as they come out with their natural lash. Each lash has its own cycle and, at the end of it, falls out with the extension still attached. What isn’t normal is extensions coming off on their own, or lots falling out in the first few days.
How often should clients book an infill?
The dermatology literature we consulted mentions infills every 2–4 weeks, because extensions are gradually lost through natural lash shedding.
Is primer essential for good retention?
It depends who you ask. Some brands recommend it for every service; others, such as Lashbase, keep it for oily lashes or skin because overuse can dry the lash out. What’s essential is that the lash is clean and dry.
How long should a client wait before getting her extensions wet?
The sources we checked advise avoiding water and steam for the first 24 hours and put the full cure at 24–48 hours. Follow your glue manufacturer’s instructions.
How far from the lid should an extension be placed?
Lashbase recommends around 0.5 mm; other industry guides say 0.5–1 mm. The extension should never touch the skin.
Sources
- Thibaut et al. (2010). Human eyelash characterization. British Journal of Dermatology
- Aumond and Bitton (2018). The eyelash follicle features and anomalies: A review. Journal of Optometry
- Platt et al. (2021). Investigating human eyelash hair follicle growth in situ and ex vivo: a pilot study. British Journal of Dermatology
- Wesley and Talakoub. Aesthetic Dermatology: Eyelash extensions (The Hospitalist)
- Lashbase: Retention issues, the reasons and solutions
- Lashbase: Top tips for perfect placement of eyelash extensions
- Curacoro: Everything you need to know about eyelash extension retention
- Curacoro: How to use lash primer for longer-lasting extensions
- Curacoro: A complete guide to lash extension sizes
- Pure Spa Direct: Benefits of using a pre-treatment primer for lash extensions
- Divine Lashes: Why are my lash extensions falling out and how to fix it
- Lash Bee Pro: Cyanoacrylates in lash extension adhesives
- Lash Affair: Lash Extension Adhesive FAQ
- Lovely: How Humidity Wrecks Your Lash Extensions (and How to Fix It)
- London Lash: Lash Extensions Patch Test Guide
