Olaplex No.4 Bond Maintenance
Olaplex No.4 uses patented bond-building technology to repair and strengthen damaged hair while cleansing gently, a genuine step up for chemically treated hair. It is expensive, but the repair and results are excellent.
Pros
- Repairs and strengthens hair
- Gentle cleanse
- Great for treated hair
Cons
- Expensive
- Best paired with No.5 conditioner