But you don't want to dry your hair out by too much washing. Try to keep it at about 3 to 4 times a week to was your hair. Four or more times can dry your scalp and hair even more and bring on more dandruff.
Also, I have tried using a green mouthwash as a rinse for my hair for dandruff. It worked for me.
Take more showers but use colder water. The hot water might dry out your scalp. Use special shampoo such as head and shoulders. And maybe use a coconut oil hair mask once or twice a week. Happy late birthday love