Firstly. Using good salon, or even certain chemist shampoos and conditioners, is very important for keeping your scalp and hair healthy.
Supermarket brands can have a lot of horrible silicon, sulfate and sodium chloride in it. There are many types of silicon but the type that gets put into most mass production shampoos and conditioners is not the best for your hair in the long term. While making your hair ultra soft and shiny instantly, they also leave a build up of this silicon on the hair, which over time, builds up on the follicle, weaken it and dry it out. Sulfate and sodium chloride are in all harsh soaps and are generally drying of hair and skin. But they are found in almost all shampoos because they lather. The trick is finding a product with lower amounts.
A great brand that is sulphate and sodium chloride free is the Trichovedic Hair Wisdom range.
Karpati Haircare shampoo and conditioner has absolutely no silicon in it and is 93% natural. It’s for all hair types and it’s found in most chemists but check stock lists.
Wen cleansing conditioner. It’s just one product and it doesn’t lather at all. Can only be purchased online.