Abscess 10% to After Root Canal. Asap!

Sir MolarTooth was paining Since Last Week,Dental Surgeon Prescribed Augmentin 625 & Combyflame & later added Metrogyl 400 Thn pain decreased 50%.Surgeon Said There is Crack in Tooth & Still Some Abscess is Beneath So Said For Root Canal Treatment.Now After 2 visits of RCT 90% Pain Has reduced.Now this time when we went for Final visit of RCT thn Dental Surgeon Said As You can see in X ray that i have attached,there is some Abscess Still there,so Said i have to take other RCT specialist advice to decide To do CAP aftr RCT on it or we should remove that teeth & whn i asked Dental Surgeon As My Father has litrally no pain now thn Can We Now make Cap to it & Later in future When it pains or discomforts him We can Remove That Molar Then Dental Surgeon Said Take Augmentin 625 twice a day for 3 days & Then We wil Put Cap on it.Sir i just Want Proper clarity That Father Should Put Cap to save Molar Tooth Now Or Molar Tooth Should be Removed.Please Refer X-ray Attached.Reply ASAP