Yes, it is possible that a treatment for lice may not be 100% effective. To ensure the treatment is fully effective, it is recommended to reapply it about one week after the initial application to make sure any new eggs are also eliminated. Good application of the product and proper technique in removing dead nits with a comb can greatly increase the effectiveness of the treatment. If a person still has lice in the days following treatment, it could be due to reinfestation.
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