Can I talk over dinner?

You can talk, but be polite. If you want to talk at dinner, you should finish your food and put down your chopsticks.

If you have dinner with close friends, it may be bad to talk too much about manners, but it is more appropriate to be casual.

For the sake of health, talking while eating may lead to suffocation or food entering the respiratory tract.

Whether to talk about it or not depends on the specific situation.