Temporary braces, that is, temporary crowns, are mostly made of self-setting resin. If the edge is not tight, the protruding part will irritate the gums, which may lead to redness and inflammation of the gums.

In addition, zinc oxide, a material for bonding temporary braces, may also cause irritation to gums.

You'd better ask a doctor to help you clean and adjust the edge of the temporary crown.