I'm having trouble again after having this tooth treated just three months ago.
I'm in a bad way again with this tooth, and you just fixed it a few months ago.
ーI'm having trouble again after having this tooth treated just three months ago.
「たったの3ヶ月前に治療してもらったのに、また困ってます」
to have trouble で「困る・手こずる」
ーI'm in a bad way again with this tooth, and you just fixed it a few months ago.
「数ヶ月前に治してもらったのに、またこの歯に困ってます」
be in a bad way で「ひどい状態にある・ひどく困る」
ご参考まで!