Hello,Surendra

Metal stuffs like button watches,chain,earrings, are bannes as they might help in copying but teeth braces are due to medical reason or condition so it is allowed in NEET exam donot worry they will not object you.

The below is the link provided for any further query related to dress code-https://medicine.careers360.com/articles/neet-dress-code.

Hope your query is answered.

All the best