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You'll need to get a special fine-toothed comb to detect lice. You can buy the comb from your local pharmacy, medical supply store, grocery store or large retailer. Read the label to make sure that you have a lice comb. This type of comb will have tooth spacing of 0.2-0.3mm in order to capture the smallest lice. It may also be black to help you more effectively identify individual louse. Avoid getting a nit comb, because they often cannot detect individual louse or lice as well as lice combs. Remember that regular combs are also not suitable for detecting lice. They don't effectively detect lice and might even reintroduce lice back into your hair. Use a regular comb to straighten and detangle your hair. This prepares your hair for using the lice comb. In addition, it may also help you more effectively detect lice. Consider wrapping a towel around your shoulders to catch falling hair that may have lice. This may keep lice from transferring to other people or areas of your home. Throw away the comb after using it to prevent re-infestation or transmission to another person. Wash and dry the towel by itself on the hottest settings possible to prevent transmission or re-infestation. Systematically combing through all of your hair minimizes the risk of not seeing lice. Pulling your hair into individual sections can ensure that you comb your entire head. Use clips or hair bands to create individual sections. Remove the clips or bands before you comb a new section. Make sure to throw away any hair bands and sterilize clips after use to prevent re-infestation or transmission to others. Once a regular comb moves easily through the hair, run the lice detection comb through your hair. Make sure to comb each individual section so that you don't miss any lice. Comb each section of hair from the scalp to the end three to four times. Repeated combing can ensure you effectively detect any lice in your hair. Be aware that lice will quickly move away from any disturbance in dry hair. Wet lice remain still, which is why wet combing may be more effective at detecting lice. As you comb each section, make sure to examine the comb for individual louse with each pass. Lice may look like dandruff, hair product residue, other small insects, or beads of dead hair tissue. Examine hair under a bright light or with a magnifying glass to best see any lice. Trap lice that you find between your thumb and the comb. This prevents the louse from getting free or static electricity from your hair from repelling it. Put the louse on a piece of tape and then throw it away to prevent transferring lice to another person. If you find a live louse, you can be confident that an active infestation is present. However, if you are unsure about something you've found, attach it to a piece of tape, put it in a Ziploc bag, and take it to a pharmacist, doctor, or other healthcare professional to confirm a case of lice. Take steps to treat the lice infestation as soon as you confirmation an active case.

Summary:
Buy a lice detection comb. Straighten and untangle hair. Section hair. Run the lice comb through your hair. Look for lice. Confirm your diagnosis.