Hey,
Well,yes you are allowed to wear braces during the NEET exam as this is something one wears because of medical issues. Still,keep the prescription of the Dentist you are under treatment with,just in case the officials on the centre of the examination ask you question,so that you can show the prescription to them.
For detailed information about the dress code of NEET,follow the link given below:
https://medicine.careers360.com/articles/neet-dress-code
Hope this helps.
Good luck.

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