A vinegar treatment won't kill head lice, but it will loosen the stickiness of the lice and lice eggs, allowing them to fall out of the hair more easily. Make a vinegar head treatment by mixing equal parts of vinegar and water. The solution is used to rinse the hair after washing it. Then, pour 1/2 cup of vinegar on your scalp. Cover your head with plastic bag and leave it for half an hour before rinsing. Then, using a fine-toothed comb, dip it in vinegar and comb the hair starting form the root to tip. This vinegar lice treatment should be used for three to five days. It is best not to shampoo the hair after applying vinegar because the hair products will reduce the acidity of the vinegar; however, the hair can be rinsed with water.
Yes, you can prevent lice with vinegar. One way to use vinegar as a prevention method is to wash your hair with equal parts vinegar and water. Use after you have washed your hair with shampoo. More information can be found at http://headlicecenter.com/head-lice-vinegar/.