It is completely normal to have a little pain
after putting braces since the forces are more soon after wire activation. Take any painkillers if it's unbearable. Few precaution you can take are
1.don't eat anything sticky like chewing gums etc, hard like bread, chikki, grams etc
2.avoid biting directly. Like don't bite the apple, rather cut it into pieces and then eat
3. Keep your mouth clean. Use a Ortho
brush or you can use your regular toothbrush 4. Stuck to soft diet
5. Anything happens to the wire or braces, call your doctor.