Is it safe to use orajel for mouth sores even though its says that it is for toothaches?

Mouth sores. The main ingredient is orajel is benzocaine, which is a mild topical anesthetic. Orajel could provide temporary relief, however, it will not cure the mouth sores. I would suggest seeing your dentist or primary health care provider to help narrow down the cause of these mouth sores.
Use it judiciously. Orajel contains Benzocaine in strengths of 10% to 20% which help relieve pain for mouth sores. This can be used to alleviate the pain for a few days, but if the symptoms do not get better, a dentist needs to be consulted. Oragel should not be used in kids less than 2 years. Oragel sore mouth rinse can be used by swishing to debride and clean the mouth.