A silicon hair brush helps massage the scalp and removes build-up without irritation. It also helps encourage blood circulation for healthy scalp and hair growth.
There's not a lot more we can add to this, so have a description of shampoo brushes instead:
What is a shampoo brush? If you have never seen or heard of a shampoo brush, they are brushes with wide rubber or plastic bristles designed to lift scalp buildup while also helping to encourage blood flow to the scalp to stimulate hair growth.
Lather a proper amount of your favourite shampoo and apply to hair and scalp.
Massage gently using the Shampoo Brush.
Rinse with lukewarm water.