Any tooth that has been root canal treated before, I think the most important thing is that we have to establish the status of teeth, whether it is a good tooth to keep. So if we assess the condition and this patient requires extraction for their treatment and if this root canal treated tooth is around the region where we normally consider for extraction, then maybe we can use braces and extract this tooth so that you do not need to bother this tooth anymore. But if we are talking about a front tooth that has been root canal treated before and has no crown, for any tooth that has been root canal treated before, it tends to be a little bit more brittle. So after putting braces, there is a slightly higher chance that this tooth may suffer a little bit of damage to the surface of the tooth.
At the end of the day, when we remove the braces, there are various things that we want to consider when we talk about root canal treated tooth. I think that it is best to go see an orthodontist and they can explain to you a bit more because as it really depends on your case and what kind of treatment is suitable for you then we can talk about the options available for you.