Clean the litter box daily. Cats defecate in the litter box every day. If too much waste accumulates, the cat will stop wanting to use it. Also, waste left in the litter box for extended periods can breed bacteria, so it's best to clean it daily. Additionally, if the litter becomes very damp or has a strong odor, it needs to be completely removed and replaced with fresh litter. 
Consequences of not changing cat litter:
1. It will breed bacteria. If cat excrement is not cleaned in the litter box for a long time, a large number of bacteria will grow, and parasites may also appear, which is very unhygienic.
2. It can cause illness in cats. Cats that defecate in unsanitary litter boxes are more susceptible to bacterial and parasitic infections, leading to urinary tract diseases and other ailments.
3. It can cause cats to urinate indiscriminately. Cats are very clean animals; they can be quite fastidious and dislike defecating in a dirty litter box, so they will look for other suitable places to relieve themselves.
4. It can affect a cat's mood. If a cat doesn't have a clean place to relieve itself, or can't find a more suitable place, it will often hold its urine, which can cause the cat to become anxious and irritable.
5. It will affect the owner's life. If the litter box is not cleaned for a long time, the odor will be very strong, and the dry litter dust will float in the air, which will have a great impact on the owner's life.
