This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The following are factors that may contribute to dandruff:

1) Not enough hair brushing
2) Yeast
3) Dry skin
4) Seborrheic dermatitis (irritated, oily skin)
5) Not enough shampooing
6) Certain skin conditions
7) Some illnesses
8) Reaction to hair or skin care products
9) Malassezia
10) Diet
11) Mental stress
12) HIV
1 5 1
Causes of dandruff
dry skin
not cleaning often enough
sensitivity to hair care products
shampooing too often

hope it helps u.....