Yes, it is recommended to brush your cat's teeth regularly. Brushing your cat's teeth can help prevent dental diseases, which can be painful and even life-threatening. It is important to use a toothbrush and toothpaste specifically designed for cats, as human toothpaste can be too harsh for their delicate mouths. Most cats will not enjoy the process of having their teeth brushed, but with patience and positive reinforcement, it can become a regular part of your cat's grooming routine.