Head Spa
The scalp is the soil hair grows in. Settling its condition improves what treatment and surgery can achieve.
A scalp loaded with sebum, dead skin, and heat is a difficult place for hair to grow. A head spa clears that environment; the method and interval depend on the state of your scalp.
It is also worth doing around surgery. Before a transplant it improves scalp condition; afterwards it is adapted to avoid disturbing the grafted area.