It is important to take very good care of any type of hair extensions and fusion hair extensions are no different. Using hair products that are specially formulated for hair extensions are recommended, in particular sulfate-free shampoo and conditioner. The bonds can become loose and slippery if they come into contact with products like conditioner and oil, so just apply these from the mid-length of the hair and down.
The hair extensions should be treated gently and not tugged at when brushing. Wait until the hair has fully dried before brushing, then gently comb it from the bottom of the hair, upwards. All types of hair extensions should basically be treated with just as much care as you would give to your natural hair, if not more so.