Dear Patient,
Your text looks confusing if you already have implant on T#21 or you are looking for Implant in T#21.
It appears from your questions that you are looking for an implant placement in T#21. FYI implant placement is a totally painless procedure done under local anesthesia. Also if you already have undergone multiple far more invasive procedures like cyst removal, Implant procedure is just 10- 15 percent of that.
So to answer your question, during procedure you dont have any pain. After procedure depending on the current situation if good bone already present then minimal discomfort for few days and doctor prescribes you antibiotic and painkiller for that. If bone is deficient and bone expansion or grafting is needed then discomfort may be present for 10-12 days. Post that if you follow instructions like salt water rinses, hygiene maintenance. Gums become ok. And after few months you can get final tooth over that
Next Steps
when you are absolutely ready to undergo the dental implant procedure, get a 3d CBCT scan done and ask doctor to check available bone and plan procedure
Health Tips
you can start doing salt water rinses and alcohol free mouthwash for a smooth recovery before and after procedure
also if you are a smoker and planning implant. quit smoking for at least 2 weeks prior. Hope this helps ! All the best