To add to the above..
People who are taking only body bath and avoiding head bath daily will suffer from Dandruff, normally. Gents can easily take head bath regularly. That doesn't mean like you gotta apply shampoo or Shika every day. You can use them once in a week and that's enough. But everyone should take head bath daily.
While taking head bath too, there's procedure. If you're using normal / cold water, you should pour the water in your head first and then go down gradually. If you're using hot / warm water, you should start from legs to head.
Ladies can't take head bath daily. So there's a solution for them. They've to wet a white cotton towel and tie it in their head before taking bath. After that only, they should take body bath. They should remove the towel from their head only after completing their bath. Now-a-days, Ladies are doing this after taking head bath. Few people are doing it even when they're taking only body bath. Probably.. Style..
The reason for this is when we pour water in our body, the temperature will change. If we pour cold water in our body first, the heat will transfer to the head immediately and will affect us. Our body can withstand a bit high temperature but not our skull. That's why, they used to put white wet cotton cloth in the fore head in early days when someone was having fever.