Blue black gum may be due to melanin which varies from person to person and it's not indicating that your gums are not healthy but to get esthetic (pink gums) you can consult periodontist. And for yellowish teeth also you should consult periodontist first. Yellowish teeth may be due to poor oral hygiene, or fluorosis, or side effect of some medicine. It can be get white by just scaling or bleaching or veneer prosthesis.
Get scaling polishing done by a dentist you may require bleaching.
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