Final answer:
The term 'texture services' refers to the variety of permanent waving and straightening services for hair, which involve chemical processes that alter hair's disulfide bonds to create waves or straighten it.
Step-by-step explanation:
The term used today that refers to the variety of permanent waving and straightening services available for various types of hair and conditions is called texture services. Perms, which may be created using thermal or chemical means, involve applying chemicals to the hair, which is then wrapped around forms to produce hairstyles.
For chemical straightening or relaxing, this process involves flattening the hair during the chemical reaction. The disruption and reformation of disulfide bonds in hair strands lead to either temporary or permanent waves.