His his extra front tooth coming in 'normally' though? Ds is 7 too and his is coming in side ways like | if you imagine the middle line is the side of the extra tooth between the two normal ones iyswim?
When my Ds was about five his front teeth got knocked in a game at primary school. This made one of his front milk teeth fall out early. Once it did, a new tooth started to grow that was twisted sideways. The dentist xrayed and said the twisted tooth was an extra as he had his two "normal" front teeth still in his gums. The twisted tooth was removed with local anesthetic without problem (he was so brave, no tears!) and his front teeth then came through normally.
My DS had extra tooth removed from roof of mouth with just a local. He was approx 10 yrs old. No mention of a GA, but every case is different I presume. It was done by an oral surgeon, however, not our usual dentist--she referred him on. HTH
It would be unusual, though not impossible, for a community dentist to have the skill set for this procedure. Whilst a simple procedure, it is delicate if the tooth is not fully erupted & is in close proximity to the other adult teeth & so best left to the max fax team who are experts. A GA for this would be very light compared to that for abdo surgery. He would probably only be in theatre 30 mins or so & home as soon as he's eaten/drank/ had a wee. Having it done under LA could be possible but would require a very cooperative child & a tooth that's almost fully through. In this case GA sounds as if it would be the kinder option.