Orthodontist and Valplast denture options? (photos)

I am 35 years old. I would like to get my teeth straightened and missing teeth replaced. For teeth straightening I am looking to use Invaslign or 6 Month Braces. Am I a candidate for either and which one produces better results? For my 4 missing teeth I would like to get valplast partial dentures as I don't like the thought (and cost) of implants. Would I be suitable for valplast dentures or are there more suitable options available? Any advice would be greatly appreciated.

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