Hair Oiling: What It Is, How to Do It, and Which Oil to Use

If you are wondering where oil belongs in your routine, start with the next step: are you about to shampoo, or are you styling clean hair? A rinse-out treatment usually belongs before washing; a lighter finishing oil usually belongs after. Hair oiling is broader than either one, and confusing those jobs is how hair ends up greasy, coated, or harder to wash.

I put oils into two categories: treatment oils and styling oils. Treatment oils are usually chosen for a pre-wash step; styling oils are usually chosen for leave-in finishing. There is a time and place for both, but more oil does not automatically mean a better result.

What is hair oiling?

Hair oiling generally means applying an oil or oil blend to the hair, scalp, or both as an intentional care step. In the version most people are searching for, the oil goes onto the hair before shampooing, sits for a period of time, and is then washed out.

The practice has deep roots in South Asian and Ayurvedic traditions; it did not begin as a social-media trend. A review in the International Journal of Trichology describes a traditional Indian routine of combing the hair, applying oil from roots to ends, and shampooing afterward. The same review also makes an important point: different oils have different properties, and many popular claims extend beyond the available evidence.

Today, “hair oiling” is also used as an umbrella term for several modern product jobs:

• Pre-wash oiling: applying a rinse-out treatment before shampooing.
• Scalp oiling: placing oil directly on the scalp, with or without oiling the lengths.
• Post-wash oiling: applying a lighter product to damp hair before styling.
• Finishing: smoothing a very small amount over dry mid-lengths or ends for shine and polish.

All four use oil, but they are not interchangeable. The first question is not “Which oil is best?” It is what job do you want the oil to do?

What can hair oiling actually do?

The most defensible benefits are cosmetic and practical. Depending on the specific oil or formula, oil can add lubrication between strands, make the surface feel smoother, increase visible shine, and help dry-feeling lengths feel easier to handle.

Research on individual oils cannot be generalized to every hair oil. Coconut oil, for example, has been studied for its interaction with the hair fiber, while other oils may mainly coat and lubricate the surface. An oil blend can behave differently from any single ingredient inside it. That is why “contains oil” is not enough information to predict how a product will feel on your hair.

Hair oiling also has limits:

• It cannot permanently fuse a split end back together.
• It is not a universal treatment for dandruff or an irritated scalp.
• A cosmetic oil should not be treated as a proven solution for shedding or hair loss.
• More time and more product do not guarantee a better result.

The useful standard is simpler: after shampooing and styling, does your hair feel softer and easier to manage without unwanted residue or weight?

Is hair oiling right for your hair?

Hair oiling is optional. It can be a useful wash-day step, but it does not belong in every routine just because it is trending.

A useful rule is restraint: start with the smallest useful amount, then look at the finished hair. If it feels flexible and polished, the amount was probably enough. If it looks separated, heavy, or unusually greasy after washing, scale back.

How do you oil your hair before washing?

A good hair-oiling routine is specific enough to repeat and simple enough to evaluate.

1. Choose a product meant for pre-wash use. A finishing oil may be too light or may not be designed to be saturated through the hair and shampooed out.
2. Read the placement directions. Some products are intended for the lengths; others explicitly include the scalp.
3. Detangle gently if needed. Removing major tangles first makes even application easier. Do not force a brush through fragile or tightly tangled hair.
4. Start with a small amount. Spread it between your palms and work section by section rather than pouring it into one spot.
5. Concentrate where the hair needs it. That may mean the mid-lengths and ends rather than automatic scalp-to-tip saturation.
6. Leave it on for the stated time. A product designed for 10 minutes does not automatically work better overnight.
7. Shampoo thoroughly. Use enough water and shampoo to cleanse the oil out, then condition as your hair needs.
8. Evaluate the dry result. Hair that still feels coated or looks stringy is feedback to use less, shorten the application area, or skip the step next time.

The current directions for RŌZ Willow Glen Pre-Wash Treatment Oil say to apply it to dry hair and scalp before washing, from scalp to ends. Leave it on for at least 10 minutes or overnight, then cleanse. Its hair-type guidance also gives a more conservative option—mid-lengths to ends—for fine, thin, greasy, or dry hair.

That is a product-specific routine, not a universal instruction for every oil in your kitchen or bathroom.

Should you apply hair oil to your scalp?

Not automatically.

Some traditional hair-oiling practices include the scalp, and some formulas are explicitly made for scalp-to-end application. But a scalp is skin. If it is comfortable and the product label includes scalp use, follow the directions and start conservatively. If your scalp has a persistent concern, routine oiling may not be the right experiment.

A Cleveland Clinic dermatologist advises that scalp oiling can be a poor fit for people prone to dandruff. The American Academy of Dermatology notes that a persistent scalp concern may need targeted care rather than another cosmetic layer.

If you notice a sudden or persistent change in your scalp or shedding after oiling, stop using the product and bring the pattern to a dermatologist or qualified clinician. “Natural” does not mean irritation-proof.

How often should you oil your hair?

There is no universal schedule.

Search results offer everything from daily oiling to once every two weeks, but those prescriptions often ignore the formula, the amount, the wash schedule, and the way the finished hair responds. Begin with the product’s frequency directions rather than a social-media calendar.

For Willow Glen, the current product page recommends weekly use or using it when the hair feels like it needs that extra pre-wash step. That is a reasonable trial cadence for that product—not a rule for all oils.

Use these signs to adjust:

• Keep the cadence if the hair washes clean and feels softer without losing movement.
• Use it less often or use less product if the hair looks flat, separated, or coated.
• Change the placement if the ends benefit but the roots become greasy.
• Stop and reassess if you notice a sudden or persistent scalp change.

A routine should respond to your hair, not make you serve the routine.

Is it better to put hair oil on wet or dry hair?

It depends on whether you are treating or styling.

• Dry hair before shampooing: common for a pre-wash treatment because you can see and feel where the oil is going before you rinse it out.
• Damp, towel-dried hair: common for a styling oil used before air-drying or blow-drying.
• Dry hair after styling: useful for a very small finishing amount on the mid-lengths and ends.

Do not use “wet or dry” as the only decision. A heavy treatment amount and a one-drop finishing amount may both go onto dry hair, but they are not the same technique.

What is the difference between a treatment oil and a styling oil?

Timing is the clearest distinction.

Choose a treatment oil primarily when you are planning a wash day and want an intentional pre-shampoo step. Choose a styling oil primarily when the hair is already clean and you want help refining the finished look.

RŌZ Santa Lucia Styling Oil belongs to this second category. Its current directions say to apply 1–2 pumps to towel-dried mid-lengths and ends. Add a few drops to dry hair if desired; for fine hair, its product page advises starting with one drop on dry ends.

Willow Glen’s primary role in this routine is pre-wash treatment. Its current directions also allow a small amount on dry ends as a style smoother when hair feels extra dry. That optional use does not turn every treatment oil into a leave-in styling oil; it is a product-specific direction.

Can you use a treatment oil and styling oil in the same routine?

Yes, when each product has a separate job. No, if you are layering them simply because the hair still “feels dry” before you have seen the finished result.

A clear two-oil routine looks like this:

1. Apply the treatment oil before washing and shampoo it out.
2. Condition and dry or style as usual.
3. Add a small amount of styling oil only if the finished lengths need more shine or polish.

That sequence is the real intent behind the original pre- and post-wash routine: give each oil a primary job, then follow the product’s specific directions for any secondary use.

Does hair oiling help hair growth?

Hair oiling can improve the cosmetic condition of the hair you already have—how it feels, how it catches light, and how easily strands move past one another. That is not the same as making a follicle grow new hair.

Research on a specific oil or ingredient should not be generalized to every hair-oiling product. A general cosmetic oil is not a proven hair-growth treatment. If growth is the reason you are oiling, separate the desired cosmetic result from the medical question. A sudden or persistent change in growth or shedding deserves an evaluation from a dermatologist or other qualified clinician rather than a longer oiling routine.

What are the most common hair-oiling mistakes?

Using the term “hair oil” as if every formula does the same thing

A pure plant oil, a blended pre-wash treatment, and a lightweight silicone-and-oil styling formula can have very different directions and finishes. Read the whole label, not just the word “oil.”

Starting with saturation

You can always add more. It is much harder to remove too much oil without rewashing. This matters most for fine hair and for styling oils that stay in.

Assuming the scalp must be included

Scalp oiling is not a required step. If the lengths are the dry-feeling area, begin there.

Leaving every oil on overnight

Use the stated timing. Longer contact can mean more residue or irritation without providing a better cosmetic result.

Treating oil as a hair-growth solution

A visible shine improvement is not evidence of new growth. If you notice a sudden or persistent change in growth or shedding, move from product experimentation to a qualified medical evaluation.

Mara’s simplest rule for hair oiling

Give every oil one clear job.

Use a treatment oil before shampooing when you want an intentional wash-day step. Use a styling oil after washing when the finished hair needs a little polish. If you use both, separate them by timing and start small enough that you can still see your hair—not just the product on it.

Explore Willow Glen Pre-Wash Treatment Oil or Santa Lucia Styling Oil when one of those jobs matches your routine.

Sources

1. RŌZ, “Willow Glen Pre-Wash Treatment Oil,” accessed 2026-09-01.
2. RŌZ, “Santa Lucia Styling Oil,” accessed 2026-09-01.
3. Cleveland Clinic, “Hair Oiling: Should You Try It?,” medically reviewed consumer guidance, accessed 2026-09-01.
4. Mysore V, Arghya A. “Hair Oils: Indigenous Knowledge Revisited.” International Journal of Trichology. 2022;14(3):84–90.
5. Dias MFRG. “Hair Cosmetics: An Overview.” International Journal of Trichology. 2015;7(1):2–15.
6. American Academy of Dermatology, “How to Treat Dandruff,” last updated December 11, 2023.