Sebastian Professional Dark Oil Smooth and Shine Mask is a rich conditioning treatment designed to deeply nourish hair while keeping it light, smooth and glossy. Part of the popular Dark Oil range, this mask blends lightweight oils with conditioning agents to soften the hair fibre, control frizz and boost shine without flattening volume.
If you are looking for a professional-quality hair mask that delivers softness and manageability with a luxury scent, here is what you need to know.
What Is Sebastian Dark Oil Smooth and Shine Mask
Sebastian Dark Oil Smooth and Shine Mask is an intensive rinse-out hair treatment formulated to hydrate, smooth and strengthen the hair. It is designed to be used after shampoo in place of regular conditioner once or twice a week.
The formula focuses on nourishment and surface smoothing while maintaining natural movement and bounce. Unlike heavier masks, it aims to condition without leaving hair feeling coated or greasy.
Key Ingredients and What They Do
This smooth and shine hair mask uses a combination of oils and conditioning ingredients to improve texture and appearance.
- Argan Oil (Argania Spinosa Kernel Oil) - Argan oil is known for its high content of fatty acids and antioxidants. It helps moisturise dry hair, improve softness and add visible shine. It also supports smoother cuticles, which reduces frizz and roughness.
- Jojoba Oil (Simmondsia Chinensis Seed Oil) - Jojoba oil closely resembles the scalp’s natural oils. It helps balance moisture, soften strands and improve flexibility. It is especially helpful for dry, brittle or overprocessed hair.
- Panthenol (Provitamin B5) - Panthenol acts as a conditioning and strengthening ingredient. It helps attract moisture, smooth the hair surface and improve elasticity, making hair feel more resilient and less prone to breakage.
- Conditioning Agents (such as Behentrimonium Chloride and Fatty Alcohols) - These ingredients help detangle hair, reduce static and improve slip. They make hair easier to comb and style while contributing to a silky, polished finish.
- Silicone Smoothing Agents - Lightweight smoothing agents help seal the cuticle, boost shine and protect against humidity. They also contribute to the sleek, glossy effect the Dark Oil range is known for.
What Hair Type Is It Best For
Sebastian Dark Oil Smooth and Shine Mask is suitable for multiple hair types, but it is especially beneficial for:
- Dry or dehydrated hair
- Frizzy hair
- Dull hair lacking shine
- Medium to thick hair textures
- Chemically treated or colour-treated hair
- Heat-styled or damaged hair
Fine hair can also use it, but should apply mainly through mid-lengths and ends and use a smaller amount to avoid over-conditioning.
Texture and Performance
The mask has a thick, creamy texture that spreads easily through wet hair. It coats strands well and provides instant slip for detangling.
After leaving it on for several minutes and rinsing, hair typically feels softer, smoother and easier to manage.Results usually include:
- Improved softness
- Better detangling
- Reduced frizz
- More reflective shine
- Smoother overall texture
Hair feels nourished but not heavy, which makes it a good balance between a deep treatment and a lightweight finish.
Scent Profile
One of the standout features of the Dark Oil Smooth and Shine Mask is its fragrance. It has a warm, rich, salon-style scent that feels luxurious and long-lasting. The scent is often described as deep and slightly sweet with a sensual, perfumed character. It tends to linger on the hair after drying, adding to the overall premium experience.
Those who enjoy fragranced hair products will likely find this mask particularly appealing.
How to Use
After shampooing, remove excess water from hair and apply the mask through mid-lengths and ends. Comb through for even distribution. Leave on for around three to five minutes, then rinse thoroughly. Use once or twice weekly or whenever hair needs extra nourishment.
Final Verdict
For just £24.99, the Sebastian Professional Dark Oil Smooth and Shine Mask is a strong choice for anyone wanting softer, shinier and more manageable hair without heaviness. With nourishing oils, strengthening panthenol and effective conditioning agents, it delivers visible smoothing and gloss while keeping hair touchable and light. My hair is at that mid-point of needing a trim and with lots of new growth, owing to the Current Body LED Hair Growth helmet, there is a fair few flyaways to contend with, so for me, this mask works really well.
It is particularly well suited to dry, frizzy or chemically treated hair and stands out for its luxury scent and salon-quality finish.