One of the most foolproof remedies for split ends, dry hair and dandruff . The egg nourishes your hair; the oil conditions it and leaves your hair feeling soft, healthy, and shiny. It is also one of the best natural straightening treatment that does not damage your hair. Apply about half a cup of mayonnaise onto your towel dried hair (quantity depends upon hair length) and not just the roots. Leave it on for 20-30 minutes. Shampoo well in cold water.