Question:

Is wearing braces allow in Islam?

Answer: 

It is not haram to wear braces since it does not constitute changing Allah's creation. What constitutes changing Allah's creation is the act of changing permanently something that is already normal. Braces are worn for crooked teeth that are not normal, so it is not haram to wear it. Resources: https://eservices.muis.gov.sg/ifaq/apps/fcd_faqmain.aspx#FAQ_156331