Having braces fitted is not painful, but a few hours after the procedure you may start to feel tightness and pressure on your teeth. This feeling gradually builds over the first 24 hours, after which the discomfort stops getting worse. It usually lasts two to three days, and in some cases up to a week. The front teeth and the teeth that were most crooked to begin with tend to be the most sensitive. It is a good idea to eat softer foods for the first few days after your braces are fitted, and cold drinks can ease the discomfort. A small percentage of patients feel no discomfort at all, which does not mean their teeth are not moving.
This answer is for general information. Your own case needs an examination by an orthodontist.