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How to diagnose stomatitis in tortoises
Pay attention to your tortoise's appetite.
When a tortoise is having issues inside of their mouth, changes to their food consumption may be the first signal. If your tortoise is eating less than they usually do, then they may have a problem developing.
If you have had your tortoise for awhile, it should be easier for you to tell that something is off. Look for signs of discomfort or stress.