Here are a few general reasons why Nanoplastia might not have worked as expected:

1. Hair Condition: The existing condition of your hair plays a significant role in how effective Nanoplastia can be. If your hair is extremely damaged, one session might not provide the desired results.
2. Incorrect Application: The effectiveness of Nanoplastia also depends on the correct application of the product. If the procedure was not performed correctly, it might not yield the expected results.
3. Aftercare Routine: Post-treatment care is crucial for maintaining the results of Nanoplastia. Using unsuitable shampoos or conditioners, not avoiding salt water and chlorine, or heat-styling your hair too soon after the treatment can lessen its effectiveness.
4. Expectations: Nanoplastia is designed to reduce frizz and make hair more manageable, but it doesn't straighten hair to the same degree as some other treatments, like Brazilian blowouts or keratin treatments. If you were expecting pin-straight hair, you might feel the treatment didn't work.
5. Product Quality: The quality and authenticity of the Nanoplastia product used can also affect the results. There are many brands available, and not all are created equal.

It's best to consult with your hairstylist or a hair care professional to understand why the treatment might not have worked for you. They can provide personalized advice based on a thorough understanding of your hair and the specific circumstances.