Is THE DOCTOR Shampoo suitable for frequent use, and how long does the 946 ml bottle typically last?

THE DOCTOR Shampoo with Tar and Ichthyol is formulated for people who need deeper cleansing at the scalp, especially if roots become greasy or flaky soon after washing. The gentler approach to hair lengths means it can be used regularly, even in households where frequent scalp-focused washing is needed. The large 946 ml bottle is practical for ongoing use, lasting longer than standard sizes. How long it lasts depends on your hair length, washing frequency, and whether you share it with others. For example, if used 2-3 times per week on medium-length hair, a single bottle can last several months. Always store the bottle in a cool, dry place and keep it tightly closed to preserve the formula. If you have a sensitive scalp or are new to tar-based shampoos, start with moderate use and adjust based on how your skin responds. Consult a specialist before use if you have chronic scalp conditions, are pregnant, breastfeeding, or take medication.