If your 2-year-old son is experiencing pain in his mouth, you can try giving him Tylenol to help relieve the discomfort. It is also a good idea to avoid giving him foods that are too hard or acidic, as these can worsen the pain in his mouth. As long as he is eating and drinking normally, and his overall condition is good, you can just keep an eye on the situation. If you have any more questions or concerns, feel free to ask for further guidance.