Gaps in front teeth. (photos)

I have had 4 teeth extractions in the past;one on each side, both upper and lower jaw. Over the years i have developed gaps in my teeth. My teeth don't look aligned and i have an overbite. This has greatly affected my self esteem. I dont smile and cover my mouth when i talk. What is the best solution for this. I have a dentist appointment this week but would love to know your opinions on this.

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