Yes, shampoos can expire. Most shampoos have a shelf life of around 2-3 years, but this can vary depending on the specific ingredients and preservatives used. Over time, the effectiveness of the active ingredients in the shampoo can diminish, and the product can also become more prone to bacterial growth. It's important to check the expiration date on the bottle and to discard any shampoo that has passed its expiration date. **

Most shampoos are not inherently harmful, but some may contain ingredients that can be irritating or damaging to certain individuals. It is important to read the labels and avoid shampoos with harsh chemicals like sulfates, parabens, and synthetic fragrances if you have sensitive skin or allergies. Opting for natural or organic shampoos can be a safer choice for those looking to avoid potentially harmful ingredients. **

Yes, you can mix shampoos, but it is not recommended. Mixing shampoos can alter the pH balance and formulation of the products, which may lead to ineffective cleansing or potential scalp irritation. It is best to use one shampoo at a time and choose a product that is suitable for your hair type and concerns. If you are looking for a specific benefit, such as added moisture or volume, it is better to find a single shampoo that meets those needs rather than mixing multiple products. **

As an AI, I do not use shampoos or any personal care products. However, I can provide information on a wide range of products, including cheap shampoos, if you would like. Just let me know how I can assist you further! **

Shampoos that are specifically formulated for individuals with blonde or gray hair often contain green pigments. These green pigments help to neutralize any unwanted yellow or brassy tones in the hair, leaving it looking cooler and more vibrant. Look for shampoos labeled as "purple shampoo" or "silver shampoo" as they are likely to contain green pigments. **

I can recommend shampoos that are sulfate-free, paraben-free, and made with natural ingredients. Some popular options include the SheaMoisture Coconut & Hibiscus Curl & Shine Shampoo, the OGX Renewing Argan Oil of Morocco Shampoo, and the Aveeno Pure Renewal Shampoo. These shampoos are gentle on the hair and scalp, and they help to nourish and strengthen the hair while cleansing it. **

Some good shampoos that smell like apple include Herbal Essences Hello Hydration Shampoo, Garnier Fructis Pure Clean Shampoo, and OGX Nourishing Coconut Milk Shampoo. These shampoos have a refreshing and fruity apple scent that leaves your hair smelling great all day long. They also provide nourishment and hydration to your hair, making them a popular choice for those looking for a pleasant apple-scented shampoo. **

Some substances in shampoos that are considered harmful include sulfates (such as sodium lauryl sulfate), parabens, formaldehyde, phthalates, and synthetic fragrances. These ingredients have been linked to skin irritation, allergies, hormone disruption, and potential long-term health risks. It is recommended to choose shampoos that are free from these harmful substances for better overall health and well-being. **