Final answer:
The method of hair extensions using a bonding material activated by heat from a special tool is called hot fusion, which uses keratin protein adhesive and a heat tool for application. This method offers durable extensions but requires professional application and regular maintenance to minimize damage to natural hair.
Step-by-step explanation:
The method of hair extensions that uses a bonding material activated by heat from a special tool is known as hot fusion or keratin bonding. In this technique, individual strands of hair extensions are attached near the root of the wearer's natural hair. Each extension is pre-tipped with a keratin protein adhesive that bonds to the natural hair when melted by the heat from a special application tool. The keratin, once hardened, creates a secure bond that can last for several months. Unlike chemical perms or relaxing methods, which involve applying chemicals to hair to alter its structure and shape, hot fusion utilizes physical bonding to add length and volume.
The application process of hot fusion can be quite lengthy, often taking several hours, as each extension is meticulously bonded to the natural hair. This method offers a long-lasting effect that blend seamlessly with natural hair, assuming it is done professionally. However, it's important to consider that this method can cause stress on the natural hair due to the heat and weight of the extensions. This is why it's crucial to have a professional assess the health of the client's hair and perform the procedure to minimize damage. Regular maintenance and proper care are essential for the longevity of these extensions and the health of the natural hair.
Another less common technique involving heating is cold fusion, which uses ultrasound waves to bond hair extensions without the need for heat. This method can be gentler on the hair but is also less widely available due to the specialized equipment required.