Why is the tooth adjacent to a dental bone graft becoming increasingly painful?

After removing the tooth and doing the implant surgery, there may be some swelling which can shift your teeth and change the bite in that area.  Call the surgeon/Dentist to have them look at the surgical site and verify you are not pounding the tooth next to the surgical site.  You could also have a rare infection that would  need to be addressed.

If you are experiencing this level of pain, you should call your dentist/doctor/oral surgeon immediately. Pain should subside, not increase. There is a possibility of infection or your body may be rejecting the graft. Do not delay, as this may get worse.

You need to check that right away,and also take some x rays, because the adjacent tooth might be involved in this healing process , by not having a good response. So, the option here could be the clinical check up, and also the antibiotic that they sent you, there could be an infection going on, that could be why its hurting. I hope this helps.