Dennis Bernard 4Bond Straightlines Keratin Smoothing Treatment
The most exciting and advanced innovation in keratin protein smoothing and anti-frizz technology. Long-lasting results for up to 5 months can be achieved depending on hair type, cleansing routine, and maintenance.
Features:
- Free of formaldehyde, parabens, sulfates, gluten, and phthalates
- 4BOND PRO EXTEND Salon Service Extender is the most exciting and advanced professional product for extending the life of salon services. Smart Target Technology, a first of its kind, infuses a Proprietary Blend of Polymers, Keratin, Quinoa and Baobab Proteins rich in Amino Acids into the hair’s cortex.
| Key Benefits | Details |
|---|---|
| Anti-frizz protection | Reduces flyaways and provides smooth texture |
| Long-lasting results | Up to 5 months with proper care |
| Safe for all hair types | Free from harmful chemicals |
FAQ
How long do the smoothing results last?
Results can last up to 5 months depending on hair type, cleansing routine, and maintenance.
Is this product safe for color-treated hair?
Yes, the product is free from formaldehyde, parabens, sulfates, gluten, and phthalates, making it safe for color-treated hair.
Can I use this at home or only in a salon?
This product is designed for home use and can be applied at home with proper technique.

Samantha Kerr –
My hair has been smoother since using this treatment. It reduces frizz significantly and feels soft after just one application. I’ve used it twice now and still see great results.
Michelle Johnston –
The product works well for my curly hair. After a few weeks, the frizz decreased and my hair looks more manageable. I like that it’s free from harsh chemicals.
Jennifer Fraser –
I’ve tried several keratin treatments, but this one stands out. The texture is natural and the hair stays smooth for months without needing frequent touch-ups.
Connor Pullman –
It took a few applications to see full results, but now my hair is less frizzy and more defined. I appreciate the ingredient list — no sulfates or parabens.