Olaplex No.6 is a smoothing cream, whilst Olaplex No.7 is a lightweight oil.
Both contain the patented Olaplex active ingredient to repair hair, however No.6 focuses on repair, moisture and smoothing hair for 72 hours, whilst No.7 will give UV and heat protection, smoothness and glass-like shine along with repair.
These can be used on their own, as well as mixed together.