Cats can start brushing their teeth around 4 months old. When the cat reaches 4 months old, you can brush the cat’s teeth to prevent the cat from having bad breath due to dental calculus. The teeth of cats under 4 months old have not yet fully grown, so you cannot brush the teeth of cats under 4 months old. It is recommended that pet owners choose suitable toothbrushes and toothpastes for their cats, and be careful when brushing their cats’ teeth to avoid accidentally injuring their cats and causing their gums to bleed.

Notes on brushing the cat’s teeth:

1. The cat’s teeth should be brushed after the cat is 4 months old. If the cat’s teeth have not yet fully grown, You can't brush your cat's teeth.

2. Choose toothbrushes and toothpastes specially designed for pets. Do not use human toothpaste for pets to brush their teeth to avoid harmful substances in them that may cause cat poisoning.

3. You don’t need to brush your cat’s teeth every day. It is recommended to brush your cat’s teeth 2 to 3 times a week.

4. If the cat is resistant when brushing its teeth and is more resistant to the owner, you can calm the cat's mood first and then brush the cat's teeth.

5. You can use cat mouthwash or tooth cleaning powder to help cats clean their mouths.