@Alphalete
Personally I think you should do it twice.
Dr. Bernstein recommends once a day, but he is bald.
Just switch to twice foam.
I don't really think there's much of a difference between the two.
Unless the foam product is damaged that you are using (doesn't come out of the tube correctly).
I guess I don't really understand the question. If it's dandruff, scalp problems, just use
the foam.