Generally speaking, its magnetic properties can be maintained for many years under normal use. But there are times when the magnetism is weakened or lost, in most cases, the magnets in use today may experience various demagnetization situations due to external factors
Magnets are made of materials composed of magnetic domains, in which atoms containing electrons have spins aligned with each other. This type of arrangement of electrons is disrupted over time in the presence of heat and external electromagnetic fields, so the magnetism weakens.
So if the magnet is heated it will easily lose its magnetism. Normally, the strength of the magnet will decrease if exposed to high temperature, but this is recoverable. If you feel that the magnetic bracelet you wear is not strong enough or weakened, you can also use a strong magnet to rub the small magnet on the bracelet, and in this way, magnetize the weak magnet. Strong magnets can rearrange the magnetic domains present in weak magnets.
You don't have to worry too much about whether your magnetic bracelet will lose its magnetism, as long as you use it normally, your bracelet can be used for many years. There are many factors for the loss of magnetism, the most important of which is that the magnetism is weakened or even lost due to excessive temperature. In general life, we will not encounter such extreme temperatures. So you don't have to worry about this.