I have a tooth (46) which is hurting for more than 2 years. Tapping and biting pressure on it. Went to Endo. CBCT scan and xrays are clear. Did first root canal in 2020 and no relief. Same symptoms. Saw another Endo and did partial distal root retreat last year and no changes. Same pain/symptoms. Endo told me to extract it as nothing worked. But he reopened the tooth to check one last time before sending be to surgeon for ext. When he reopened,mesial canal filling was wet, stinking and blood color changes like purplish. But no pus and he didn't say if it's infected. He placed calcium hydroxide inside and it's been 41 days now. No relief. So he told me to go for ext now. Taken CBCT again and nothing found. But they told me to extract it,since no relief from pain. My primary pain is in lower jaw under ear and that's how pain started. If I extract it,do I need to do immediate bone graft only? I want to do implant later. Can I do bone graft after few years of extraction? Help.