If you’ve been wearing eyelash extensions, you’ve probably wondered whether you need a lash fill or a full set at your next appointment. The answer depends on how many extensions you have left, how long it’s been since your last visit, and the current state of your natural lash growth cycle.
A lash fill (also called an eyelash extension refill) replaces extensions that have shed naturally with your lashes. A full set applies extensions to every lash from scratch. Knowing which service you need saves time, money, and ensures your lashes always look their best.
This guide covers everything you need to know about lash fills versus full sets, including when to book each service, how often to maintain your extensions, and what to expect during your appointment at Labelle Eyes in Westmount or Laval.
Quick Answer
A lash fill replaces shed extensions on existing lash sets, typically booked every 2-3 weeks when 40% or more extensions remain. A full set applies extensions to every natural lash from scratch, needed for first-time clients or when too many extensions have fallen out.
What Is a Full Set of Eyelash Extensions?
A full set of eyelash extensions is the initial application where a certified lash technician applies individual extensions to each of your natural lashes. This creates your complete lash look from start to finish.
During a full set appointment, your technician starts with a clean slate. They cleanse your natural lashes, create a custom lash map based on your eye shape, and carefully attach extensions to 80-95% of your healthy natural lashes.
The process typically takes 90-120 minutes for classic lashes, 120-150 minutes for hybrid or volume lashes, and up to 180 minutes for mega volume sets.
Full sets include several extension styles:
- Classic lashes: one extension per natural lash
- Hybrid lashes: mix of classic and volume fans
- Volume lashes: 2-6 ultra-fine extensions per natural lash
- Mega volume lashes: 7-16 ultra-fine extensions per natural lash
You’ll need a full set of classic eyelash extensions if you’re a first-time client, if you’ve gone more than 4-5 weeks without a fill, or if fewer than 40% of your previous extensions remain.
Key Takeaways
- Book a fill every 2-3 weeks when 40% or more extensions remain
- Choose a full set if you’re new or missed more than 4 weeks
- Expect fills to cost 50-60% less than full sets in Montreal
- Maintain retention with oil-free cleansers and gentle brushing daily
- Ask your technician to assess extension percentage before each appointment
What Is a Lash Fill (Refill)?
A lash fill, also called an eyelash extension refill, is a maintenance appointment where your technician replaces extensions that have shed naturally along with your lash growth cycle. It keeps your lash set looking full and fresh between appointments.
During a fill, your technician removes any outgrown or poorly adhered extensions, then applies new ones to natural lashes that have grown in since your last visit. They also fill in any gaps where extensions have fallen out.
Fill appointments are significantly shorter than full sets. Classic fills typically take 45-60 minutes, while volume and hybrid fills take 60-90 minutes depending on how many lashes need replacement.
Most clients book fills every 2-3 weeks to maintain consistent fullness. At Labelle Eyes, our technicians assess each client’s retention pattern at every appointment, adjusting fill timing recommendations based on individual lash growth cycles and lifestyle factors.
Lash Fill vs Full Set: Key Differences Compared
The main differences between lash fills and full sets come down to application time, cost, and how many extensions remain on your natural lashes. Understanding these differences helps you book the right service and budget accordingly.
The 40% Retention Rule
If you have 40% or more of your extensions remaining, you’re a good candidate for a fill. Below 40% retention, you’ll need a full set to achieve a balanced, full look.
Here’s what different retention levels look like:
- 70-90% retention: significant fullness with minor gaps, perfect for a 2-week fill
- 50-70% retention: noticeable thinning but still balanced, suitable for a 3-week fill
- 40-50% retention: visible gaps and uneven distribution, maximum threshold for a fill
- Below 40% retention: sparse coverage with major gaps, requires a full set
Time and Cost Comparison
Time and pricing differences between fills and full sets are substantial, making regular maintenance appointments significantly more economical than waiting too long between visits.
| Service Type | Time Required | Montreal Price Range | Recommended Frequency |
|---|---|---|---|
| Classic Full Set | 90-120 minutes | $150-$250 | First appointment only |
| Volume Full Set | 120-180 minutes | $200-$350 | First appointment only |
| Classic Fill | 45-60 minutes | $65-$110 | Every 2-3 weeks |
| Volume Fill | 60-90 minutes | $85-$140 | Every 2-3 weeks |
Montreal’s lash extension market is competitive, with pricing influenced by location, technician experience, and studio reputation. Downtown and Westmount studios typically charge at the higher end of these ranges due to premium locations and certified technicians, while suburban Laval locations often offer more affordable rates. At Labelle Eyes, both our Westmount and Laval studios maintain consistent pricing that reflects our technicians’ certifications and experience. For specific pricing details, consult our comprehensive pricing guide for Montreal lash extensions.
Ready for perfect lashes?
Book your consultation today at our Westmount or Laval studio and let our certified lash technicians create your perfect look.
When Should You Book a Full Set vs a Lash Fill?
Knowing when to book each service saves time and money while ensuring your lashes always look their best. The decision depends on your current lash situation and how long it’s been since your last appointment.
When You Need a Full Set
Book a full set in these situations:
- You’re getting lash extensions for the first time
- It’s been more than 4-5 weeks since your last appointment
- You have fewer than 40% of your extensions remaining
- You want to switch from one lash style to another (classic to volume, for example)
- Your extensions have grown out significantly and look uneven
When a Fill Is Right for You
Book a lash fill when:
- You have 40% or more of your extensions remaining
- It’s been 2-4 weeks since your last appointment
- Your extensions still look relatively full with minor gaps
- You want to maintain your current lash style
- Your extensions are evenly distributed across both eyes
The ideal fill timing is 2-3 weeks for most clients. At this interval, you’ll maintain consistent fullness without letting retention drop too low.
How Different Lash Styles Affect Fill Frequency
Each lash extension style has unique retention characteristics that determine how often you’ll need fills and how long your lashes stay full between appointments.
Classic lashes attach one extension per natural lash, with retention averaging 2-3 weeks. Most clients book fills every 2 weeks to maintain consistent coverage. Hybrid lashes combine individual classic extensions with handmade volume fans, creating wispy texture with retention averaging 2.5-3.5 weeks.
Volume lashes use 2-6 ultra-fine extensions per natural lash in handmade fans. Multiple attachment points create stronger adhesion, with retention typically reaching 3-4 weeks. Volume lash extension refills maintain dramatic fullness with less noticeable shedding between appointments.
Mega volume uses 7-16 ultra-fine extensions per natural lash. The dense fan structure provides the longest retention (3-4 weeks), though clients typically maintain 2-3 week fill schedules to preserve the dramatic, full appearance this style requires.
How to Maintain Your Lashes Between Fills
Proper aftercare dramatically impacts how long your extensions last and how full your lashes look at your next fill appointment.
Cleanse your lashes daily with an oil-free lash cleanser. Oil breaks down lash adhesive faster than anything else. Use a gentle foaming cleanser designed specifically for extensions, apply it with a soft cleansing brush, and rinse thoroughly with cool water.
Brush your lashes every morning and after cleansing. Use a clean spoolie brush to gently separate lashes and restore their shape. Avoid oil-based products near your eyes, including makeup removers, facial oils, cleansing balms, and heavy eye creams.
Sleep on your back when possible, or use a silk pillowcase. Cotton creates friction that can pull on extensions during the night. Skip mascara, especially waterproof formulas. If you must use mascara, choose a water-based formula designed for extensions and apply it only to the tips.
Comparison: Which Option Is Right for You
Choosing between a fill and a full set depends on your current situation, while selecting your lash style affects your maintenance schedule and budget.
If you have 40% or more extensions remaining and it’s been less than 4 weeks since your last appointment, book a fill. You’ll save both time and money while maintaining your current look. If you’re new to lash extensions, have fewer than 40% remaining, or it’s been more than 4-5 weeks since your last visit, book a full set.
For lash style selection, consider both your desired appearance and lifestyle. If you want a natural enhancement, classic lash extension refills maintain your subtle look affordably. For textured dimension, hybrid lash refills preserve your wispy style.
| Choose This | If You Want | Retention Period | Fill Frequency |
|---|---|---|---|
| Classic | Natural, everyday look | 2-3 weeks | Every 2 weeks |
| Hybrid | Textured, wispy dimension | 2.5-3.5 weeks | Every 2-3 weeks |
| Volume | Full, dramatic glamour | 3-4 weeks | Every 2-3 weeks |
| Mega Volume | Maximum fullness and drama | 3-4 weeks | Every 2-3 weeks |
Your lifestyle also matters. If you work out daily, swim frequently, or have naturally oily skin, you might see faster shedding regardless of style. In these cases, booking fills every 2 weeks instead of 3 keeps your lashes looking full.
If you’re unsure whether you have enough lashes left for a fill, send a photo before booking. Our technicians can assess your current extension percentage and recommend the right service, saving you time and ensuring the best results.
Frequently Asked Questions
What is the difference between a lash fill and a full set?
A full set applies extensions to every natural lash from scratch, creating your complete lash look. A lash fill replaces extensions that have shed naturally, adding new extensions to grown-in lashes and filling gaps to maintain your existing set. Fills work only when you have 40% or more extensions remaining.
How often should I get a lash fill?
Most clients need fills every 2-3 weeks to maintain optimal fullness. Your natural lash growth cycle sheds 20-40% of lashes every two weeks. Booking fills every 2 weeks maintains 70-85% fullness consistently, while 3-week intervals typically result in 50-65% retention.
How do I know if I have enough lashes left for a fill?
If you have 40% or more of your extensions remaining with relatively even distribution across both eyes, you’re a good candidate for a fill. Below 40% retention, or if your extensions look patchy and clustered unevenly, you’ll need a full set. When in doubt, send your technician a photo before booking.
Can I get a lash fill at a different salon than where I got my full set?
Yes, you can get fills at a different salon, though your new technician may need extra time to assess your existing extensions and match the style. Some salons charge slightly more for fills on work done elsewhere. If your current extensions are poorly applied, your technician might recommend starting with a fresh full set.
What happens if I wait too long between lash fills?
Waiting more than 4 weeks between appointments usually results in retention below 40%, meaning you’ll need a full set instead of a fill. Extensions that remain are often grown out too far from your lash line and clustered unevenly. Starting fresh with a full set costs more than maintaining regular fills every 2-3 weeks.
Understanding the difference between lash fills and full sets helps you maintain beautiful extensions without overspending or showing up for the wrong appointment. The 40% retention threshold is your guide: above it, book a fill; below it, book a full set.
Since 2014, Labelle Eyes has helped Montreal clients maintain gorgeous lash extensions through personalized fill schedules and expert aftercare guidance. Our certified technicians at both the Westmount and Laval locations assess your retention at every appointment, adjusting recommendations based on your unique lash growth cycle and lifestyle.
Ready to book your next lash appointment? Whether you need your first full set or a maintenance fill, schedule your appointment at our Westmount location at 4055 Saint-Catherine St W, Unit 115, or our Laval studio at 3742 Boulevard Levesque O. Call (438) 408-6826 with questions about which service is right for you.
