After a period of time, the phone headset manufacturers close to the ear part of the headphone line began to harden, can a recruit let it back to the original state?

Edit answer:
This problem is commonly found in the product of the ear plugs, the main reason is air oxidation, mobile phone headset manufacturers grease corrosion caused by plastic material aging. Known as the headphone cable protective layers are rubber products, rubber product itself will change because of the difference of temperature, but this change of state is not lasting, general with the temperature returned to normal, it will also return to normal. For a thin layer of rubber on the headset, mobile phone headset manufacturers if oxidation, grease corrosion, will be different degrees of permanent hardening and can not recover. Especially oily skin and easy to sweat with a home, the cable becomes hard case more universal.
Here are some of the methods of protection:
One: as far as possible to avoid the use of the environment at high temperature and low temperature, mobile phone headset manufacturers can some extent, delay aging;
Two: don't go around the back of the neck, sweat will cause corrosion line, line hard, until disconnection;
Three: don't put the ear wire wrapped around the machine too tight;
Four: no need to be placed in the place to avoid direct sunlight, mobile phone headset manufacturers are best dry and ventilated place;
Five: the key is to select the headset, earphone of mobile phone manufacturers to distinguish the wire about types, such as Apple's first wife headset that hollow line can greatly reduce the wire becomes hard.