Thanks for asking the query,
As you have mentioned there is no gap in between the tooth for flossing, the gap is closed by composite restoration.
Usually very tight contacts are not desired, as it is very difficult to remove sticky substances from between the teeth leading to formation of caries.
Space for brushing with small interdental brush
I would suggest you to get the checkup done take an x-ray and get the corrections done in the restoration if needed.
Hope this helps out.