The bonding technique is a simple method that actually bonds the hair extensions to the scalp with the use of a chemical. Hair is divided into horizontal sections and wefts of extensions are actually glued into the open scalp. This technique needs to be removed within a week or so, to make sure that damage to the scalp is minimal. The chemical applied is a medical grade adhesive, but it should never be applied to a sensitive scalp. Bonding is not the safest method for adding extensions, but it is amongst the fastest techniques and can be used for a quick fix.