It depends on each person's specific needs. The hair extensions can be attached in Permanent, Semi-Permanent or Temporary ways.
The major methods of extensions are Clip-in hair extensions, Sewn in hair extensions, Micro bead extensions, tape in and fusion hair extensions.
Clip-in hair extensions are by far the most popular and are temporary. The other methods are semi-permanent hair extension methods.
The link below explains these methods clearly.
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