3 ms·

Dandruff is primarily caused by bacteria on the scalp. The selenium ingredient (remember 'Evolution'?) in anti-dandruff shampoo acts as a anti-bacterial agent,

• puredemo 16y ago
  It's not always that cut and dry, no pun intended. Although flaky skin might be caused by bacteria sometimes, there can be other causes as well. For instance, extremely low fat diets are known to cause dry flaky skin, bacteria or no.