Pets don't brush their teeth. Do they ever get tooth problem?

The thing is, pets usually eat very well if their owners look after them properly. So I don't think brushing is always necessary. A lot of animals in the wild seem to have a pretty decent set of choppers. My cat only eats supposedly-nutritious (disgusting) cat food and refuses to drink anything other than water. If I did that, I doubt I'd have to brush my teeth half as much. A lot of us drink tea, coffee, or in my case soft drinks (soda) nearly every day. With the amount of teeth-rotting things we eat and drink, it becomes a necessity to brush anything harmful away. If pets don't have that problem in the first place I think brushing is only necessary if their teeth are showing signs of decay.