As long as you’re using the proper product in your hair, you can shampoo and condition every day, 1,000 times a day, without any side effects -- but, again, only if you’re using the right product. Just use common sense. If your hair is dry, don’t use a shampoo that removes oil -- you’re just drying out your scalp. Use normal shampoo and conditioner, and it’s fine to wash frequently. There’s that myth that your hair will fall out, but it’s not true. If it’s going to fall out, it’s in your blood.