She emphasized that applying oil to a dirty scalp can exacerbate issues rather than provide benefits. Dr. Shetty explained that oiling an unclean scalp, especially one that is oily or has dandruff, can drive impurities deeper, leading to inflammation and conditions like folliculitis.

Traditionally, many apply oil before washing their hair, but Dr. Shetty advises that oil should be applied to a clean scalp to ensure optimal absorption and effectiveness. This approach helps in maintaining scalp health and prevents potential complications arising from trapping dirt and oils. 

Complementing this perspective, celebrity hairstylist Jawed Habib suggests that oil should be applied to damp hair rather than dry. He recommends wetting the hair with lukewarm water before oiling, allowing better penetration and effectiveness of the oil. After application, combing the hair and leaving the oil in for about five minutes before washing can enhance results. 

In summary, for effective hair oiling:

Cleanse the Scalp First: Ensure the scalp is clean before applying oil to avoid trapping impurities.

Apply Oil to Damp Hair: Use lukewarm water to moisten hair prior to oil application for better absorption.

Short Duration: Leave the oil in for a brief period, such as five minutes, before washing it out.

Adopting these practices can lead to healthier hair and scalp, maximizing the benefits of oiling.