Pay close attention to your guinea pig's eating habits. Changes in her eating habits may be the cause of tooth problems. When you perform a weekly health check, always check the teeth to make sure they are wearing evenly, there are no cracks and that the teeth aren't discolored. Lastly, weigh your guinea pig on a regular basis. If your guinea pig's weight starts to drop, there could be an issue with her teeth that is preventing her from eating properly.