For the first few days after getting a retainer, it’s typical for it to be uncomfortable, tight, or painful. Even if the soreness lasts for a week, it’s usually not a cause for concern. However, if retainer pain persists for longer than a week, you should see your orthodontist. A retainer should not cause you to have persistent, ongoing pain that makes it difficult for you to function normally regularly. Learn more in our blog article, "Retainer Too Tight."