Many people keep them next to the toilet for years, thinking they are clean, but in fact they collect dirt and microorganisms that can threaten health. Ideally, the brush should be replaced about every nine months. Even if it looks clean, bacteria that remain in the bristles can cause infections, especially if someone in the household has digestive issues. The brush retains not only bacteria from the water but also bits of toilet paper and residue of dirt, which further increases the risk. After each use, it is good to rinse the brush thoroughly, and at least once a week disinfect it. Attention should be paid to signs that the brush is worn out: bent bristles, color change, or an unpleasant smell are signs that it is time for a replacement. Regular replacement and cleaning maintain toilet hygiene and the health of all household members.