Welcome to just answer.
I would really suggest you get this missing tooth i.e 15 replaced with either bidge work(as it is less expensive) or implants with bone grafts.Yes you can very well get the extraction and bone graft at same time.
It is not wise and appropiate to leave any empty space of the missing tooth unattended. This can cause other teeth to drift ahead and also in your case lower tooth 18 might Supraerupt.
This will happen as the opposing tooth will have no contact while occlusion
Also as wee have two molars on each side ..the need of second one would not have arised if we could just worked well with one.Molars bear all the forces of mastication
and are the most functional and essential teeth in the oral cavity
forces sometimes play a role in its etiology as there is some tooth movement taking place throughout the age,The drifting teeth become crooked and misaligned making them more prone to decay
because they are harder to keep clean.Also a missing tooth sequale can number of problems
, can also effect your jaws, can also give you headaches, etc.
Look at the link: (this will give you an insight on a missing tooth in the oral cavity in general, do read consequences of missing teeth) http://www.gumsurgery.com/tooth_drifting.htm
So, i believe if you can you should get the tooth replaced!
I hope this answers all your questions.Feel free to contact me again if you have doubts and we can discuss it
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