I just tried this...took one drop, put it in a tablespoon measure and added my dollop of herbal toothpaste, mixed well and slathered my toothbrush with it. I LOVED IT! It really got my whole mouth feeling a little tingly but really clean.
I held the toothpaste foam in my mouth about 30 seconds before rinsing.
I also put the drops in my shampoo and washed my hair but it may take time for me to see differences there since I do not have any external problems like dandruff or itching. I was concerned about getting any lather in my eyes but it was easy to keep it off my face.
Thanks for the tip and I'll have to order the book :)