It won't grow back. Your gums look sore - see a periodontist or hygienist regularly to prevent gum recession. The only thing you can do to change the appearance is have some cosmetic dentistry to meet the margin but that's not recommended because there are too many other risks (plus you may not be considered a good candidate if you have poor gum health). Flossing is important but so is lifestyle. Do you smoke, eat a healthy diet? it's a combination of factors. Sometimes if you're unlucky, hereditary.
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