There might be some general soreness of the teeth and mouth. Usually, this is not enough to interfere with your daily routine, but if soreness is severe, Motrin (ibuprofen) is the most widely used pain reliever for children and adults. Please consult your orthodontist or dentist before taking any pain medications.
While your teeth are sore, avoid hard foods that require chewing. It is best to eat soft, nutritious foods such as pasta, soups, applesauce, mashed potatoes, etc. The discomfort is usually limited to the first few days after the braces are placed.
The teeth may even appear loose but don't panic. Your teeth must loosen first so they can move, but they will firm up again.