Ans. Sweat itself does not necessarily ruin the hair, but the salt and minerals present in sweat can contribute to hair issues. When sweat dries on the scalp, it can cause a buildup of salt, which may lead to dryness and potential scalp irritation. Additionally, excessive sweat can make the hair feel damp, causing it to become weighed down or prone to frizz. It is important to cleanse the hair and scalp regularly to remove sweat and maintain a healthy environment. Using a gentle shampoo and practising good hygiene can help minimize any potential negative effects of sweat on the hair.