Dandruff and similar seborrheaic flaking are often associated with overacidity and sluggish blood or lymph and may be combined with a fungal problem. The first cause is overacidity. The backup of blocked waste comes thru the pores of scalp. Immediate relief may be found with organic apple cider as a pre shampoo and/or as a final rinse...after soaking for several minutes. Continue with alkaline foods and lessening of acid forming foods such as sugar and junk.