New Crown has gap on the side. Any suggestions?

I had a porcelain over metal crown done 3 weeks ago, however, there is a gap between the crown and gumline on one side which traps food and which I cannot get to with floss as the side edges wont allow me to. I went back to the dentist who said the gums are inflamed and once settled will seat the crown better. My gums are better now but the gap remains. I am concerned since I cant get bottom with floss I might be susceptible to infection, although I keep my mouth clean by flossing andbrushing.

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