It’s hard to say because there’s lots of different causes of dandruff. You can have sebum build up, dry scalp, fungus stuff. If it’s sebum build up, the scalp massage can help as can shampoo that markets itself as scalp invigorating. But not stripping or cleansing if you can help it. It can also help dry scalp in conjunction with a moisturizing shampoo. You can always mix in something like a dandruff specific shampoo every few washes. But honestly, even though it sucks, finding a good stylist in your city and booking an appointment and indicating that you’d like to have a consultation beforehand can be a ton of help. It’ll be more expensive than just getting a cut but going forward you’ll know what you need and how to ask for it.