hello
please dont accuse your
dentist because he just removed the calculus between your teeth which were actually damaging the gums and creating space between teeth.so its the calculus and not the dentist who created the gap
now what i would suggest is that before any prosthetic treatment please maintain proper oral health .
for this u need to do following
1.luke warm saline rinses 4-6 times daily
2.hexidine mouthwash after breakfast
3.also dont forget to brush before you go to sleep after dinner
now about your concern about your prosthetic
you have three option viz
1.orthodontic treatment which is expensive , time taking but non invasive
2.3/4th crown which is less expensive , invasive but less time taking
3.full crown which is also less expensive and time taking but most invasive
if you go with option 2 or 3 try to have an appointment with prosthodontist
if you go with option 1 you nedd an orthodontist
hope this helps