The internet's favourite promise deserves an early death: you cannot train your scalp to produce less oil. Sebum output is set by hormones and genetics, not by your shower schedule. Does hair train itself? No — it just gets dirtier while you wait.

What you can do is push the moment of greasiness back by a day or two, without punishing your scalp. Here is what actually moves that needle.

Wash better, not less

  • Use a mild shampoo, not a stripping one. Harsh surfactants remove the lipid film completely and the skin answers with more oil by evening.
  • Turn the water down. Hot water dissolves sebum efficiently and stimulates the glands while it does it.
  • Two short lathers beat one long one. The first lifts the bulk, the second cleans the skin.
  • Rinse longer than feels necessary. Shampoo and conditioner residue at the roots is a very common reason hair looks dirty on day two.
  • Keep conditioner from the mid-lengths down.
  • Touch your hair less. Hands in your hair and brushing "for shine" both move oil down the strand faster.

How to go longer between washes

  1. Apply dry shampoo before you need it. Put it on clean or barely-oily hair in the evening — it absorbs, it does not dissolve. Brush it out properly the next morning.
  2. Change the style, not the shampoo. Hair up, a little lift at the roots, or simply moving your parting to the other side buys a day.
  3. Clarify every two or three weeks. Silicone and styling buildup weighs roots down independently of oil.
  4. Wash pillowcases often and your brush weekly. Both put oil straight back on clean hair.
  5. Shift the schedule in half-days, not from daily to every fourth day in one jump.

Skip the detox advice

Going a week without washing so your scalp can "rebalance" produces itching, odour and a decent chance of flaking — not drier roots. Alcohol tonics and bicarbonate scrubs irritate skin, which raises oil output. Vinegar rinses do little beyond a brief squeak.

When something else is going on

If oiliness increased sharply over a few weeks with no change in products, or arrived with large yellowish flakes, persistent itching or noticeable shedding, the answer is not a different shampoo. See a doctor or trichologist — seborrhoeic dermatitis and hormonal shifts are diagnosed in a consulting room, and significant hair loss should be assessed rather than waited out.

Faberlic stocks shampoos for oily scalps, dry shampoos and clarifying formulas; see the current catalogue on faberlic.com, which refreshes roughly every three weeks. For the wider routine, see the haircare guide.