Shampoo should not be used casually, especially during some special periods, such as pregnant and lactating women, you need to pay special attention to the choice of shampoo.

shampoo should indeed be thoughtful, considering individual needs, hair type, and specific life stages. Casual or indiscriminate use might not address your hair's specific requirements or could potentially lead to issues, especially during special periods such as pregnancy and lactation. Here are some considerations:

1. Pregnancy and Lactation: During these times, hormonal changes can significantly affect hair texture and volume. It's crucial to choose gentle, non-toxic shampoos, avoiding those with harsh chemicals or strong fragrances that could potentially harm the mother or be transferred to the baby through breast milk. Look for products that are specifically labeled as safe for pregnancy or contain natural ingredients.
2. Sensitive Skin or Scalp: If you have a sensitive scalp, casual use of shampoos with harsh detergents, fragrances, or other irritants can exacerbate conditions like dandruff, eczema, or contact dermatitis. Always opt for mild, fragrance-free, and hypoallergenic formulas.
3. Color-Treated Hair: Using a regular shampoo on chemically treated hair can strip away the color faster. Instead, choose shampoos formulated for color-treated hair, which are milder and often contain color-lock technology.
4. Dry or Damaged Hair: Frequent use of clarifying or volumizing shampoos on already dry or damaged hair can further deplete moisture. Opt for moisturizing or repairing shampoos with ingredients like keratin, argan oil, or shea butter.
5. Oily Hair: While it might be tempting to wash oily hair more frequently, over-shampooing can stimulate the sebaceous glands to produce even more oil. Using a gentle, balancing shampoo and focusing on the scalp rather than the lengths can help regulate oil production.

In summary, the selection and use of shampoo should be based on your hair's current condition, your lifestyle, and any special health considerations. Reading labels, understanding ingredients, and being mindful of your hair's needs can help ensure that you're using shampoo in a way that benefits, rather than harms, your hair and overall wellbeing.