How does those hair treatment creams harm your hair?

there are certain hair products that comes in packages. like a shampoo, a conditioner and a hair treatment cream. however, for the treatment, it can only be used once to twice weekly. i was just wondering, if we use more than twice a week, will it harm our hair?How does those hair treatment creams harm your hair?
It might harm your hair because of the chemicals in it,,,


maybe using it more then you should will harm your hair because you are putting too many chemicals than you should..

white hair