Article Management:

• Last Updated: February 15, 2026
• Next Review Date: August 15, 2026
• Author: LASHMAITRE Strategic Editorial Team

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Table of Contents

1. The Untapped Market: Why Under Eyelash Extensions Are Your Next Goldmine
2. The Aesthetic Argument: Balance, Symmetry, and the “Doll” Effect
3. Technical Protocol: The “Reverse” Application Method
4. Sourcing Strategy: Why You Cannot Use Top Lashes for the Bottom
5. Safety First: Managing Fumes and Gravity
6. Financial Impact Analysis: The “Add-On” Revenue Model
7. Troubleshooting: Why Bottom Lashes Fall Off Faster
8. FAQ: Overcoming Artist Hesitation
9. References & Authoritative Sources

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<a name=”intro”></a>

1. The Untapped Market: Why Under Eyelash Extensions Are Your Next Goldmine

In the hyper-competitive lash industry of 2026, finding a differentiator is difficult. Everyone offers Volume, everyone offers Wispy. But look closely at your competitors’ menus: how many truly specialize in under eyelash extensions? Very few.

For the B2B salon owner, this gap is a massive opportunity. Under eyelash extensions (applying extensions to the lower natural lashes) transform a standard set into a red-carpet look. It is the difference between “wearing mascara” and “total eye transformation.”

However, many artists avoid them because they find the application awkward or fear the retention is poor. This avoidance is leaving money on the table. By mastering the specific protocols for under eyelash extensions and stocking the correct J-curl inventory, you can position your salon as the “Full Service” expert, justifying a premium price point that competitors cannot match.

As a factory-direct brand, LASHMAITRE provides the specialized micro-lengths (5mm-7mm) required for this delicate work. This guide is your operational manual to turning the bottom lash line into your bottom line profit.

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<a name=”aesthetic”></a>

2. The Aesthetic Argument: Balance, Symmetry, and the “Doll” Effect

To sell under eyelash extensions, you must explain the visual benefit to the client. It is not just “more hair”; it is about optical balance.

The “Top-Heavy” Problem

When we apply Mega Volume to the top lashes (12mm-15mm) and leave the bottom lashes bare, it creates a “top-heavy” shadow. The eye can look sleepy or closed off because the visual weight pushes the lid down.

The Balancing Act

Under eyelash extensions act as a counterweight.

• Vertical Expansion: By adding length to the bottom, you physically stretch the eye’s visual footprint vertically. This creates the “Open Eye” or “Doll Eye” effect that mimics high-fashion photography.
• Face Slimming: Believe it or not, longer bottom lashes draw the eye downward, creating an illusion of a shorter mid-face, which is associated with youthfulness.

Marketing the Look

Don’t ask “Do you want bottom lashes?”

Ask: “Do you want to balance out that volume so your eyes look wider? I can add under eyelash extensions to create a complete frame for your eyes.”

Table 1: Visual Impact Analysis

Feature	Top Lashes Only	Top + Under Lashes
Eye Shape	Defined Top Line	Rounder, Larger Appearance
Balance	Can look Top-Heavy	Perfectly Symmetrical
Makeup Need	Client still needs lower mascara	Zero Mascara Needed
Photography	Shadows under eyes	High Definition / No Shadows

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3. Technical Protocol: The “Reverse” Application Method

Applying under eyelash extensions requires a completely different ergonomic approach than top lashes. If you try to lash them the same way, you will fail.

Taping Strategy: The “Open Mouth” Technique

• The Challenge: When eyes are closed, bottom lashes tuck inward or lay flat against the skin.
• The Fix: Use tape to gently pull the lower lid downward (towards the cheek), exposing the root.
• Note: The eyes must remain closed. You are manipulating the skin, not opening the eye.

Application Direction: Inverted Placement

• Top Lashes: You place ON TOP or to the SIDE.
• Under Lashes: You must place UNDER or to the SIDE.
• Gravity: Placing the extension under the natural bottom lash uses gravity to help the bond. If you place it on top, gravity pulls it away.

The “Painting” Technique

Bottom lashes are often chaotic. You don’t need to lash 100% of them.

• Protocol: Aim for 30-50% coverage. Focus on the outer corners and the center. Avoid the very inner corners where tears pool, as this will cause the under eyelash extensions to pop off immediately.

Alt Text: Taping technique for applying under eyelash extensions safely.

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<a name=”sourcing”></a>

4. Sourcing Strategy: Why You Cannot Use Top Lashes for the Bottom

A common mistake is using leftover top lashes (8mm C-curl) for the bottom. This looks unnatural and “spider-like.” Under eyelash extensions require specific inventory.

The Curl Profile: J or B Curl

Natural bottom lashes grow straight or slightly downward.

• C/D Curl: If you put a curly lash on the bottom, it curls up into the top lashes, causing them to hook together like Velcro. This is a disaster.
• The Solution: You MUST source J-Curl (almost straight) or B-Curl (slight lift) for bottom lashes. These mimic the natural downward growth pattern.

The Length Profile: Micro-Lengths

Standard trays start at 8mm. That is too long for the bottom.

• Requirement: You need specialized trays with 5mm, 6mm, and 7mm lengths.
• LASHMAITRE Solution: Our “Lower Lash Mix Trays” provide these hard-to-find lengths in a soft 0.07mm or 0.10mm diameter.

The Diameter: Keep it Light

Bottom lashes are weaker.

• Avoid: 0.15mm or 0.20mm. They are too heavy and will droop.
• Use: 0.07mm (for natural look) or 0.10mm (for mascara look).

Table 2: Top vs. Bottom Lash Inventory

Spec	Top Lash Inventory	Under Lash Inventory
Curl	C, CC, D, M	J, B
Length	8mm – 15mm	5mm – 7mm
Diameter	0.03 – 0.15mm	0.07 – 0.10mm
Purpose	Lift & Volume	Definition & Balance

Shop Wholesale J-Curl Bottom Lash Trays

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<a name=”safety”></a>

5. Safety First: Managing Fumes and Gravity

Applying under eyelash extensions carries a higher risk of irritation because the work is done while the eye is potentially slightly open (if taped incorrectly) and fumes fall downward.

The “Fume Fall” Physics

Cyanoacrylate fumes are heavier than air. They naturally sink.

• Top Lashes: Fumes fall away from the nose/eye.
• Bottom Lashes: Fumes fall onto the cheek or into the nose.

Adhesive Selection

• Do Not Use: Your 0.5s “Power Bond.” It is too fumy and cures too fast for the delicate placement of bottom lashes.
• Use: Sensitive / Low Fume Adhesive. You need a slightly slower cure (1-2s) to allow you to position the lash perfectly without rushing.

Eye Pad Placement

You must use a thin hydrogel pad or foam tape placed over the top lashes (taping upper lashes to the upper lid) to keep them out of the way. Never let the top and bottom lashes touch during the procedure, or you will glue the eye shut.

Low-Fume Sensitive Adhesive for Bottom Lashes

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<a name=”finance”></a>

6. Financial Impact Analysis: The “Add-On” Revenue Model

Why bother with the difficulty of under eyelash extensions? Because the margins are incredible.

The Time vs. Money Equation

• Service Time: 20-30 Minutes.
• Product Cost: $1.00 (Minimal lashes used).
• Service Price: $40 – $60.
• Hourly Rate: $120/hour.

The “Upsell” Strategy

Bottom lashes are the perfect “impulse buy.”

• Script: “We have 20 minutes left in your appointment. Would you like to add under eyelash extensions today for a special price of $40? It will completely finish your look so you don’t need mascara.”

Table 3: Annual Revenue Projection (Add-On)

Metric	Details
Add-On Price	$50
Conversion Rate	20% of clients
Weekly Clients	20 (4 buy add-on)
Weekly Extra Profit	$200
Annual Extra Profit	**$10,400**

Analysis: An extra $10k a year just by utilizing the last 20 minutes of an appointment slot efficiently.

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<a name=”troubleshooting”></a>

7. Troubleshooting: Why Bottom Lashes Fall Off Faster

You must manage client expectations. Under eyelash extensions do not last as long as top lashes.

The “Rubbing” Factor

• Reason: We rub our eyes, wipe away tears, and apply concealer under the eyes. Bottom lashes experience 10x more mechanical friction than top lashes.
• Retention: Average retention is 2 weeks (compared to 4 weeks for top lashes).

The Solution: Pricing & Policy

• Policy: “Bottom lashes are a semi-permanent event service. Expect 10-14 days of wear.”
• Pricing: Price it lower ($40-$50) to reflect the shorter lifespan, or sell a package (“Bottom Lash Mini-Fill” for $25).

Aftercare for Bottoms

Advise clients to avoid rich eye creams or oil-based concealers directly under the lash line, as these oils will travel up the lash and dissolve the bond of the under eyelash extensions rapidly.

Download the “Bottom Lash Aftercare” Guide

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8. FAQ: Overcoming Artist Hesitation

Q1: Can I perform under eyelash extensions with eyes open?

A: Absolutely NOT. This is dangerous. Fumes will burn the eyes, and one slip of the tweezer could cause corneal abrasion. The client’s eyes must remain closed. We use specific taping methods to expose the bottom lashes while keeping the eye shut.

Q2: Will bottom lashes look like spider legs?

A: Only if you use the wrong product. If you use 0.15mm thick, 10mm long C-curls, yes, it will look scary. By using LASHMAITRE’s 0.07mm J-Curl in short lengths (5-7mm), the result is soft, feathery, and defined—like a perfect coat of mascara without the clumps.

Q3: Can everyone get under eyelash extensions?

A: No. Clients with Entropion (lower lashes that turn inward and poke the eye) or extremely sparse/non-existent bottom lashes are not candidates. Always analyze the bottom lash line health before promising the service.

Q4: Do I need special tweezers for bottom lashes?

A: It helps. Because the angle is inverted, a shorter, curved tweezer or a 45-degree angle tweezer often gives better control than the long straight tweezers used for isolation on top.

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9. References & Authoritative Sources

To ensure credibility, this article references data from:

1. National Center for Biotechnology Information (PubMed):Ocular Anatomy and Eyelash Growth Patterns.
   • https://pubmed.ncbi.nlm.nih.gov/
2. Cosmetics & Toiletries:Adhesive Fume Dynamics.
   • https://www.cosmeticsandtoiletries.com/
3. Vogue Business:Service Menu Expansion Strategies.
   • https://www.voguebusiness.com/beauty

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Conclusion: The “Full Frame” Advantage

Under eyelash extensions are the final frontier of lash artistry. They separate the “technicians” from the “artists.”

By offering this service, you tell your clients that you care about the complete picture. You solve their mascara smudging problems and give them a balanced, high-impact look that turns heads. And for your business, it is the most efficient way to increase your hourly rate without finding new customers.

Partner with LASHMAITRE to source the specific J-Curl micro-lengths and low-fume adhesives needed to execute this service safely and beautifully.

Lash the bottom. Raise the bottom line.

[CTA: Shop Our Wholesale “Bottom Lash” Starter Kit] | [CTA: Watch the “Reverse Application” Tutorial]

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