Great, thanks for raising Query.
Skin and hair represents ur entire core Health and mental equilibrium.
Ayurved shares its like layer cream on milk.
Its luster n smoothness length depends on core Dhatus like Ras, Rakta, Mans Asthi.
Ur daily routine habits of food exercise sleep motion can influence it's pattern.
So I request just follow ur mom n grand ma.
Health Tips
Reduce salty and sour food n drinks and late night life along with hot water shower from head.