Sebitar also contains ingredients to control the flaking and dryness of the scalp as it gently cleanses the hair. Unlike some other harsh dandruff and treatment shampoos, Sebitar treats the hair gently. It does not tangle or matt the hair or effect permed or tinted hair. Sebitar is gentle on a reddened or inflamed scalp, it should not sting or cause irritation. Sebitar has a pH of 5.5 to match the pH of the scalp and maintain its natural protection against infection. In the case of psoriasis for further treatment apply EgoPsoryl TA to the scalp overnight and cleanse with Sebitar in the morning. Maintenance Program. As with dandruff and seborrhoeic dermatitis, Hair Science Shampoo and Conditioner may be used when the conditions such as scalp psoriasis and scalp dermatitis are under control.