62-year-old woman with extracted tooth #13 one month ago. What do I do?

One month ago I get a tooth extracted (tooth number 13). I'm a 62 yr old woman. My dentist says that I may have to get a sinus lift & possible bone grafting. Instead of going through that complicated procedure which may have repercussions, can I just leave it missing? I'm fine with that. Thank you.

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