Is a pretty face really necesary?

I've read a couple questions and it seems that guys really for a pretty face on first impressions, but I don't have anything that comes close to pretty. My eyebrow is cut in half by a scar, and my teeth are terrible. The front teeth stcik out and the bottom teeth criss cross and I can't even close my mouth properly. Would guys really take these as signs not to approach me?
Is a pretty face really necesary?
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