To detect dental problems in pet rodents, you can observe their eating habits and behavior. Look for signs such as drooling, excessive grinding of teeth, difficulty eating, weight loss, or reluctance to eat hard foods. Also, check their teeth regularly for overgrowth, discoloration, or misalignment. If you notice any of these symptoms, it's important to consult a veterinarian who specializes in exotic pets for a thorough dental examination and appropriate treatment.