In general, sound waves can enter the inner ear in two ways, through air conduction or through bone conduction, and then the auditory nerve passes to the auditory center to present sound. Common bone conduction headphones and in-ear headphones have certain advantages and disadvantages, but from the damage to the eardrum, consider in-ear headphones are more harmful. 1, bone conduction headphones: bone conduction can convert sound into mechanical vibration, and then through the human skull to transmit sound waves to the auditory nerve, so as to achieve clear sound. Therefore, on the one hand, bone conduction headphones do not block the ears, which can reduce discomfort, on the other hand, bone conduction headphones on both ears less damage to the tympanic membrane is generally not much damage. But bone conduction headphones in a noisy environment, poor listening, noise is obvious, need to be close to the skull to have a better effect, the use of a longer time may cause head pain; 2, in-ear headphones: that is, in-ear headphones, sound waves generated by sound vibration eardrum to conduct sound, so the use of the ear canal needs to be sealed to reduce the impact of external noise on sound transmission, thereby increasing the quality of sound. However, in-ear headphones are usually made of silicone or polyvinyl chloride and come in different thicknesses, so they may affect the comfort for different people. In addition, if you use in-ear headphones for a long time and the volume is high, it may damage your hearing. Therefore, you can choose the right headphones according to your personal needs, but you need to avoid using them in scenarios such as driving and mechanical operations to avoid adverse effects. In addition, you need to pay attention to regular cleaning of headphones, so as not to stain the ear secretions for a long time in the headphones caused by bacterial growth, causing ear canal infection.