Two in one shampoos are generally good as they can save time when colouring your hair. If your hair is healthy and hasn’t undergone a lot of chemical processing, a two-in-one shampoo and conditioner will probably work fine for you. Most shampoos contain conditioning agents anyways, but a two-in-one has added moisturizing agents to make hair glossy. However if you have oily hair, you probably won’t need the extra moisture. A two-in-one could coat your hair and leave them feeling heavier and greaser. If you shampoo your hair frequently you should also stay clear of two-in-one shampoo and conditioners. The detergent in the shampoo strips the hair of its natural oils, so you will need a separate conditioner to replenish them. Two-in-one shampoo and conditioners also aren’t sufficient enough to hydrate dry, damaged hair because they do not contain enough conditioners.