since your age is 14, you are at the stage of puberty
at this stage the even little infection will be aggravated. so i suggest go to dentist
, take proper scaling sittings, if it is infected you may need antibiotics also.
take proper care of brushing twice a day, learn from your dentist the method of brushing for proper care.
as you have braces please dont use floss as it may entangle in your brackets and harm your wiring treatment(ortho) process.