Need your opinion on what I need to get done to correct the space between the teeth? (Photos)

Recently I had 2 root canals and cavity fixed, They put crown on one of the root canal and repair the crown on rightside root canal, There is bone loss between the rightside crown and the tooth. Food gets stuck so now the dentist says to use waterpic for now and rebuild the crown (that was repaired), for permanent solution. Also due to gum decease there is lot of space between the teeth. My dentist is suggesting to do 4 crown on upper teeth and 2 crowns on bottom one.

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