1. On top of indicates a position higher than the object.
Pattern: verb + on top of + noun
They put the blanket on top of the sheets, and the bedspread on top of the blanket.
I’m sure I left my keys on top of the desk.
to be on top of something—to be sure about one's knowledge or control of something Her son had a hard time learning math, but he is on top of it now.
How to prevent Hair Fall
Cut down on the dye and chemicals
Frequent use of hair colouring chemicals increases the chances of serious damage being done to your hair. Never colour your hair more often than every 4 to 6 weeks. If you do dye your hair, it s a good idea to use a conditioning shampoos or conditioners after shampooing.When it comes to going gray, it's a lot kinder to your hair to let it turn grey than to dye it.