Replied by Ted (Bangkok, Thailand)
Dandruff is caused by fungus issues as well as a vitamin A and vitamin D deficiency. The recommendation was based on resolving fungus problems which will take many continuous applications to rid of the dandruff entirely. It is the same thing with nail fungus, they are hard to rid of. Taking cod liver oil of one tablespoon per day will reduce the dandruff issues also as well as taking some salmon oil and other fish oils regularly. These will relieve the scalp from drying too. I have seen people cured of dandruff, as long as tea tree, lavender, ACV and H2O2 is used over long term about a month or so of regularly use. However, you need to take salmon, fish oil and cod liver oil to get it controlled. It is necessary that you avoid all fried foods and vegetable oils and replace these with the use of coconut (unhydrogenated) oil or the use of good old fashion lard instead.
Pillows and others will caused reinfection so it is necessary to launder them regularly using borax and other detergents that uses sodium percarbonate or sodium perborate too. Most chlorinated bleach will also be ideal to rid of fungus. Carpets are also the main source of fungus and molds and therefore require cleaning or removal of them through the use of hydrogen peroxide to rid of them.
The regular use of ACV, H2O2 will not cause fungus to be resistant and it will in no way develop any resistance to them. Just regular use is of an extreme necessity