First, as expected, is the dry shampoo stage. Cusick says it’s a non-negotiable for her, and she recommends Olaplex 4D Clean Volume Dry Shampoo, £28, but we also love Arkive’s The Revival Dry Shampoo, £12.

Once that’s massaged in, Cusick brushes her hair to figure out what she’s working with. Don’t stress, though – this is the stage that’ll take you from feeling hopeless to hopeful.

Next is the most surprising tip: working oil through the hair. Cusick explains that this step is especially good for those with combination hair, which tends to be greasy at the roots but gets dry at the ends. It also helps to defrizz and add some hydration back into strands. This is where things start to take shape.

This is how to revive second (or third or fourth) day hair, according to a hairdresser