Bottom lash extensions: are they worth it for your next lash set?

If you love full, fluttery lashes, you might already be familiar with upper lash extensions. But have you ever considered bottom lash extensions? This lash trend is gaining attention for its ability to balance your overall look, add definition to your eyes, and make your lash set feel complete.

Close-up of before and after bottom lash extensions from cannybeautylashes_rosemead

In this blog, we’ll explore everything you need to know about bottom lash extensions: what they are, how they’re applied, whether they’re safe, how long they last, and if they’re right for you.

What are bottom lash extensions?

Bottom lash extensions (also called underlash extensions or underlashes) are semi-permanent lashes applied to your lower lash line. While most lash sets focus only on the upper lashes, this technique gives a more defined, doll-like appearance by enhancing your bottom lashes too.

Instead of relying on mascara for the bottom lashes, lash extensions on bottom lashes create a natural, smudge-proof finish that frames your eyes beautifully.

Are bottom lash extensions safe?

Yes, bottom lash extensions are safe when applied by a trained lash artist. Like any lash service, proper technique and quality products are key. During bottom lash extension application, your eyes remain closed and protected with under-eye pads or tape.

The lash artist will use lightweight lashes (often 0.05mm to 0.07mm in thickness) and gentle adhesives to ensure your natural bottom lashes aren’t damaged.

If you’re wondering, “can you get lash extensions on the bottom?” or “are bottom lash extensions safe?” — the answer is yes, as long as you go to a licensed and experienced technician.

How much do bottom lash extensions cost?

Bottom lash extensions are typically an add-on service, not a full set on their own. Prices range between $15 and $40, depending on your location, salon reputation, and the complexity of your lash set.

Some lash studios offer package pricing for top + bottom lash services. Always check with your lash tech during your consultation to confirm what’s included.

How long do bottom lash extensions last?

Bottom lash extensions typically last 7 to 10 days, shorter than upper lashes. This is because lower lashes are finer, more exposed to tears, and experience more rubbing or oil transfer from skincare.

Pro tip: Gently cleanse the eye area daily to keep both upper and bottom lashes clean and long-lasting. Here’s our Lash Extension Aftercare Guide.

How bottom lash extensions are applied (what to expect)

The application process is delicate and detail-oriented. Here’s what happens:

• Lash artists typically use shorter lengths (4mm–7mm) and softer curls like J curl or B curl to mimic the natural direction of lower lashes.
• The extensions are isolated and placed on individual lower lashes using precise tweezers.
• A fast-drying, low-fume adhesive is used to prevent eye irritation.

Bottom lash extension application usually takes 15–30 minutes and is often done at the end of an upper lash set session.

Curious how are they applied by lash techs, check out the process here:

 

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Who should try bottom lash extensions?

Underlash extensions are perfect if you:

• Want a more balanced or symmetrical lash look
• Love the wide-eyed, K-beauty or doll lash aesthetic
• Often skip lower mascara due to smudging or sensitivity

They pair beautifully with natural lash extensions or light volume sets, especially when aiming for a soft glam or clean look.

Check out this post on Top 5 new lash trends in 2025 for lash artists to see how bottom lashes are making waves in the industry.

What do bottom lash extensions feel like?

They should feel weightless and natural. If applied properly, you won’t even notice them.

Some clients report that they forget they have underlash lashes until their next appointment! If your extensions feel poky, stiff, or irritating, they may have been applied incorrectly.

Can I wear mascara on bottom lashes with eyelash extensions?

It’s best to avoid mascara on your bottom lash extensions. Mascara can clump the extensions and weaken the adhesive bond, shortening their retention.

If you really want extra drama, opt for a lash-safe mascara on your upper lashes only, and ask your lash artist to apply more dense bottom lashes instead of using mascara.

Final thoughts: are bottom lash extensions worth it?

If you’re someone who pays attention to detail and loves a polished look, bottom lash extensions are a game-changer. Whether you’re going for natural, doll-like, or editorial-inspired lashes, adding a few well-placed lower lashes can elevate your entire set.

Just make sure to book with an experienced lash technician and follow proper aftercare.

Want to see real-life underlash styles? Follow us on Instagram @charmlashvn

Common concerns and FAQs

Can you remove bottom lash extensions?

Yes – they can be professionally removed at the salon using lash-safe cream or gel remover.

Do eyelash extensions keep sticking to bottom lashes?

This can happen when upper and lower lashes are glued together – usually due to poor isolation. It shouldn’t happen if applied correctly.

How to put on underlash extensions?

You shouldn’t DIY underlashes – bottom lashes are harder to isolate and glue near the eye requires training. Trust a lash pro!.