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How to treat dental problems in gerbils 
Look at your gerbil's teeth. 
Gerbils' teeth continue to grow throughout their lives. To keep their teeth from growing too long, gerbils need to gnaw or chew on something.
Possible answers: *Metal dental dentures need to be fitted to keep the teeth from rusting. The teeth that are fitted in place tend to grow faster. *Eating right from their dish may help keep this teeth healthy. Check the food panel of your gerbil's dish. *If your gerbil doesn't have much to chew or gnaw on, or is old and cannot chew very well, his teeth will begin to overgrow. Sometimes, your gerbil may have broken or missing teeth. *Gerbils have long, thick, and healthy teeth. Some gerbils only eat once a day.
If your gerbil doesn't have much to chew or gnaw on, or is old and cannot chew very well, his teeth will begin to overgrow. Sometimes, your gerbil may have broken or missing teeth.