Flat tooth & gaps - what can be done? (Photos)

I never got one of my premolars, so I never lost my child-molar and I'm 21 now. However I don't like how there's a gap and I feel as if I can't chew food as well on that side because of the gap. Now I'm wondering what the best option to fix this is. I was thinking maybe composite, rebuilt in the shape of a premolar with cusps leaning lingually.

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