Question: What is the ruling on braces?
Answer: “Braces are of two types:
First type: if the purpose is to increase in beaut. Then this is haram and it is not allowed. The Prophet (ﷺ) cursed the
المتفلجات للحسن المغيرات لخلق الله
and those who create spaces between their teeth artificially to look beautiful, such ladies as change the features created by Allah [Bukhari no. 5943]
This is along with the fact that it is desired for her to adorn herself and she is one who is brought up with adornments. For the men, it is more deserving to be prohibited from that.
The second type: if the straightening is due to a blemish then there is no harm in that. For some people have some of their teeth protruding either their front teeth or other than it.
It protrudes or emerges with an emergence that is deficient such that the one who sees him will find it unattractive. So in this situation, there is no harm for a person to straighten it because it is removing a blemish and not increasing in beauty. What proves that is that the Prophet (ﷺ) ordered a man who got his nose cut off to take a nose made of silver. Then it developed a stench so he ordered him to take a nose made of gold” [Saheeh Sunan Abi Dawood no. 4332]. This is because it is removing a blemish and the intent is not to increase in beauty” [Majmoo’ al-Fatawa wa-Rasaail (17/23)].
Faisal Ibn Abdul Qaadir Ibn Hassan