You can heat style as often as you would heat style your own hair. Glam Seamless Hair Extensions use 100% ethically sourced real human hair and as such all of our extensions will behave as real human hair. We suggest ALWAYS using a thermal protectant and a mild heat setting.
Just remember heat styling constantly will eventually negatively impact the disulfide bonds of the hair - leading to them being permanently broken and with you having heat damaged hair and extensions!