The golden rule of lice identification is that if you can move the object with a light touch or by blowing on it, it’s dandruff. Lice crawl too fast to really be seen, they are the size of a sesame seed or strawberry seed and lice eggs (nits) are actually glued to the hair shaft and cannot be moved unless cut off or extracted with an nit special comb.
If the ‘white stuff’ is simply dandruff it is on the scalp and not on the hair shafts, then it might not be head lice at all. Instead of lice treatments, you might try a medicated shampoo, like Selsun or Neutrogena T-gel.
Want a professional to come take a look? Our Lice Head Check Service is only $15/person (two person minimum)..
See what Lice Look Like
How To Lice Treatment Guides