Causes of Keratin Hair Extensions falling out – Common reasons and how to fix them

Are you wondering: “Why are my keratin hair extensions falling out?” If so, don’t worry! In this article, we’ll explain the common reasons why keratin hair extensions (also known as keratin-bonded extensions) tend to come loose from your natural hair, and provide solutions to help keep your extensions secure, long-lasting, and beautiful over time.

What are keratin hair extensions?

Keratin hair extensions are one of the most modern and popular hair extension methods today. Real human hair strands are bonded to your natural hair using keratin glue – a safe adhesive compatible with human hair – applied with heat. This method provides a natural look, high durability, and comfortable wear. However, despite its many advantages, keratin hair extensions do have one significant downside: they may fall out if not properly cared for or if installed incorrectly.

How long do keratin hair extensions last?

Typically, keratin hair extensions can last from 2 to 3 months, depending on how well they’re maintained and the condition of your natural hair. However, in some cases, the extensions may fall out earlier than expected, causing discomfort and affecting your appearance.

So, What causes keratin hair extensions to fall out?

Here are 10 common reasons you should be aware of:

10 Common causes of keratin hair extensions falling out early

1. Low-Quality Keratin Glue

The quality of the keratin glue is the most important factor in determining the durability of the extensions. Using cheap, substandard glue will result in poor adhesion, causing the extensions to slip or fall out easily. Low-quality glue can also cause itchiness, scalp irritation, or even allergic reactions.

2. Using Too Little Glue or the Wrong Amount

Using too little keratin glue, especially for heavier hair strands, results in weak bonds. Over time, these extensions may easily slip off. Some may confuse glue-saving techniques with micro K-tip methods, which can increase the risk of shedding.

3. Incorrect Bonding Technique

Common mistakes during application include:

• Not fully melting the glue before applying;
• Using the wrong clamping technique;
• Forming weak or uneven bonds with air bubbles or gaps.

These issues often cause extensions to fall out within just a few days to a week.

4. Over-Trimming the Glue Bond

Some stylists trim the glue bond too much to make it less visible, but this can weaken the connection between the natural and extension hair. It’s better to create a small, neat bond from the beginning without needing to trim it afterward.

5. Attaching Extensions to Damp Hair

When hair is still damp, the keratin glue cannot bond properly, leading to weak adhesion and eventual shedding. Additionally, avoid washing your hair for at least 24 hours after getting extensions to allow the glue to set fully.

6. Oily or Improperly Cleaned Hair

Excess oil or leftover shampoo/conditioner on the scalp can prevent the glue from adhering properly. This slippery surface can cause extensions to fall out easily, especially right after application.

7. Naturally Silky Hair or Hair Treated with Keratin/Straightening Treatments

Hair that is too smooth (either naturally or chemically treated) makes it harder for the glue to stick. Without natural texture on the hair shaft, the extensions may not stay in place long.

8. Improper At-Home Care

Common at-home care mistakes include:

• Using round-bristle brushes that create friction and tug on bonds;
• Brushing from top to bottom instead of bottom to top;
• Overusing styling products like gel or hairspray without timely cleansing;
• Applying oils or oil-based products near the bonds;
• Using high heat from dryers or straighteners directly on the glue;
• Sleeping without tying up the hair, leading to tangling and pulling.

9. Poor Installation Technique

Including:

• Placing the extensions too close to the scalp, causing discomfort and tension on hair roots;
• Using extensions that are too thick or heavy for natural hair, causing strain;
• Incorrect glue placement—too close or too far apart—causing tangling, difficulty in detangling, and shedding.

10. Personal Health Conditions

Hormonal factors such as pregnancy, breastfeeding, hormone treatments, or medication use can affect your natural hair growth cycle and lead to increased shedding, which may also cause extensions to fall out.

How much hair loss is normal for extensions?

Throughout their 2–3 month lifespan, losing about 5–10% of your extensions is considered normal. For example, if you have 100 strands applied, losing 5–10 strands over a few weeks is acceptable. However, if more than 15% of the extensions fall out, it’s worth reviewing both the installation technique and your at-home care routine.

Extensions falling out after 1–2 weeks – what’s the cause?

• After 1 week: Most likely due to poor technique or low-quality glue.

• After 2 weeks or more: Usually related to improper home care.

How to prevent keratin hair extensions from falling out

To keep your keratin extensions secure for as long as possible, follow these tips:

• Use high-quality keratin glue, which can be tested under UV light (good glue has a distinct fluorescent glow);

• Form the glue bond correctly: the ideal shape resembles a rice grain – slightly thick in the middle and tapered at both ends;

• Maintain proper aftercare at home: use a special extension brush, avoid oil-based products, and tie your hair before sleeping;

• Avoid applying keratin straightening treatments close to the scalp—leave at least a 5 cm gap;

• Choose extensions that match your natural hair type:

  • Fine/thin hair: use virgin Slavic hair;

  • Thick hair: opt for dyed Russian hair;

  • Strong, healthy hair: European hair is suitable.