Using olive oil to kill lice is economical, natural and non-toxic. It is also convenient, since most people already have olive oil in their homes.
Using a lice comb for killing lice takes a LOT of time. It can take days of constant combing to get rid of lice, but it's certainly worth it. Lice combs are relatively inexpensive, and they don't require the use of poisons.
Hedrin is a product available on the market in the U.K. but it is possible to buy it online no matter where you are. It is even available on eBay. It kills head lice without the use of toxic chemicals, and it is extremely effective. Lice cannot become immune to it as they have to many over-the-counter poisons.
If you have a stubborn lice infestation, Vaseline may be a last resort. It is quite difficult to get off the hair, but it will smother the lice if left on the hair overnight. Just be prepared to spend a lot of time getting the Vaseline out of your hair after killing lice.
Many of the poison shampoos on the market are simply ineffective now because lice have become immune to them over time. However, some people like to use them to knock out a small number of the lice to make it easier to comb the rest out or to smother the stragglers.
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