When you get your hearing aid fitted in store, your hearing care professional will usually adjust your hearing condition to the most appropriate condition to meet your individual listening needs. As a result, you will feel a good hearing compensation effect for the first period of wear.
However, with the passage of time, the hearing condition will change, and some improper operation and maintenance negligence may also lead to the discounted effect of the hearing aid, and even various problems such as whistling and discomfort, so it is necessary to return to the store for re-adjustment. In order to make your hearing aids last longer, let's learn Xi recognize the signs that your hearing aids need to be refitted. 
01.Whistling sounds from hearing aids
Have your hearing aids experienced a change in volume, accompanied by a sizzling or chattering sound?
This means that, for some reason, your hearing aids no longer fit in your ears, or because of an impact that has caused some parts inside to become loose or damaged and need to be replaced or repaired. In this case, you should communicate with your hearing care professional in time and do not disassemble and repair it yourself. 
02.The volume of hearing aids is not as clear as it used to beAs we age, some older people experience hearing loss. Some diseases and the use of ototoxic drugs may also cause changes or fluctuations in hearing. If you feel that your hearing aids no longer seem to be able to hear as clearly as you used to, or worse, your hearing loss is experiencing unexplained fluctuations, contact your hearing care professional immediately for further hearing screening. 03.Pain or discomfort in the earIf you feel that your hearing aids are becoming more and more uncomfortable to wear, there is a possibility that the material of the earmold has deteriorated, or the earmold does not match perfectly due to changes in the ear canal (which often happens to children with growing ears), and you need to take it to the fitting center in time to get it replaced. Ill-fitting earmolds can cause a series of problems such as whistling and ear canal damage, so don't delay and be patient. 
Just like a car's engine needs to be adjusted regularly, maintenance and refitting after a period of time is also part of managing your hearing aids on a daily basis.
It is generally recommended to return to the fitting store every 3-6 months to check the function of the hearing aid to ensure that the acoustic and electrical function is kept in the best condition and enjoy good listening quality.