Force Scalp Sebum Production?

Is it possible to permanently damage the Sebaceous gland to where it is not secreting any sebum? Two yrs ago i used a re moist intensive hair treatment and left it in my hair for several hours and every since then my hair has been brittle and dry.

I know that sounds crazy but my hair just hasn’t been the same. While i might be wrong about the product that i left in my hair causing my brittle, dry hair, one thing i do know is that (all of)the hair on my head is very unhealthy. Im debating to see a doctor about it but im afraid to waste my money to just be told to use a deep conditioner, which i have been.

Is there any thing that a doctor could do about very brittle, dry hair? Or is there any way to get the body to produce more sebum?

Maybe it is probable, but I do not really know. Some people just have dry and brittle hair, and it can change during one’s life. I do not know of any way to increase sebum production aside from perhaps washing it regularly.