Before you buy hair extensions, it's important to understand how they work and the different types available. Hair extensions are often categorized by length, but there are many other types of extensions, like tape-in extensions or wefting extensions. Here's a guide to using Hair extensions

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1. Choose the right type of extension: There are many different types of hair extensions, from tape-in extensions to wefting extensions. Each has its own benefits and drawbacks. Before you buy, be sure to research which type is best for your needs. 

2. Decide the length of your extension: Most hair extensions come in lengths ranging from 8 inches to 16 inches long. If you want a longer extension, be sure to choose a wefting extension rather than a tape-in extension. 

3. Get acquainted with the tools required for installing hair extensions: Many hair extension kits include all necessary tools for installation, but if not, be sure to purchase them separately. You'll need a hair straightener, curling iron or wand, comb, scissors and adhesive remover/glue. 

When shopping for hair extensions, there are a few things to keep in mind. First, make sure to get a set that is tailored to your own hair type and width. Second, try to find a set with a good quality clip system so that the extensions stay in place throughout the day. Third, be sure to research which brands offer the best quality hair extensions.