A cochlear implant is an electronic device in which an extracorporeal speech processor converts sound into a certain coded form of electrical signal and restores, improves and reestablishes the hearing function of a deaf person by directly exciting the auditory nerve through a system of electrodes implanted in the body. Cochlear implants are now used worldwide as a routine treatment for severe to total deafness. The cochlear implant is the most successful biomedical engineering device available. Patients who are deaf, especially children, also lose their auditory speech function because they cannot receive sound signals. Therefore, for these patients, the ultimate goal of treatment is to re-establish auditory and speech functions so that they can integrate into mainstream society. In Japan, one of the first children to receive a cochlear implant is now a successful otolaryngologist. Cochlear implants involve many aspects and parents have various questions. I’ll give a demonstration of some of the high frequency questions here. 1. Duration of surgery It is now well established that the younger the age of implantation, the better the results. Currently, the minimum age of implantation reported internationally is 4 months. The most difficult part for very young infants and children is the hearing assessment. Therefore, please operate as soon as hearing is confirmed by various tests. 2. Evaluation of preoperative examinations Various examinations are used for hearing evaluation. Many families of children are obsessed with the results of imaging tests such as cochlear malformation or internal auditory canal stenosis. Once the behavioral audiometry and electrophysiology confirm the presence of residual hearing, it can be ruled out that the cochlear nerve is not developed or is underdeveloped. The child can then be considered for cochlear implantation. 3. Post-operative speech training Post-operative speech training is very important. In addition to professional speech training, it is important for parents to be actively involved in their child’s speech training. Therefore, it is important for parents to interact and communicate with their children more often. 4. Cochlear implant programs The National Disability Federation and provincial disability federations now have many cochlear implant programs. The specific programs vary from province to province, so please inquire at your local disability association.