Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose hamster dental problems [title] Look for signs your hamster isn't eating. [step] Overgrown teeth make it difficult for the hamster to eat. This is because the long teeth force the jaws permanently apart, the long teeth grow into the roof of the mouth or pierce the lips, or the teeth develop sharp jagged edges that make eating painful.

Ending1: For example, look for overgrown teeth starting from the rear or front row of teeth. [substeps] The teeth grow outward from the front row, sometimes going past the incisors. Ending2: [substeps] If your hamster's food is not disappearing like it usually does, then it may not be eating due to dental problems. [title] Don't assume food that disappears has been eaten. Ending3: [substeps] Large, overgrown teeth give your hamster a toothache. The teeth have grown out of the head and will disappear any time the hamster eats the food. Ending4: [substeps] Plaque production around this part of the mouth can also cause dental problems. So, your hamster might eat litter, sticky or waxy cat litter, poop, or even human food.

Answer format: ending1/ending2/ending3/ending4