Using the same shampoo can be a beneficial or detrimental decision, depending on your individual hair and scalp type. If your scalp is oily and your hair is fine, using the same shampoo for an extended period of time can lead to product build-up, which can leave your hair feeling heavy and dull. On the other hand, if you have dry hair and a dry scalp, using the same shampoo can help your hair retain moisture.
It's important to consider the ingredients in the shampoo you are using as well. If the product is loaded with harsh detergents, it can strip your hair of its natural oils, leading to dryness and damage. Choose a shampoo specifically formulated for your hair type, and look for natural ingredients like aloe vera, coconut oil, and honey.
In general, it's not a good idea to use the same shampoo for a long period of time. Instead, switch shampoos every few weeks to ensure your hair is getting the nutrients it needs to stay healthy. You should also condition your hair regularly to keep it from becoming dry and brittle. Finally, make sure to get regular trims to prevent split ends and breakage.