Like all other electronic devices, security cameras may face wear and tear over an extended period of use. However, if you can identify any particular threat to your CCTV camera, you can mitigate that. Here are some tips that may help you in this regard,
1. Mount the camera at a height to avoid intentional smudging
2. To prevent damage from rain and other elements of nature, make sure the CCTV has a good IP rating
3. In winter mornings, the camera lens may get foggy; you can put some bags of silica gel inside the camera housing
4. For door cameras, place them outside your door for a better viewing angle
5. Hide the camera to avoid damage from offenders