Hello Welcome in H.C.M. I have gone through your query regarding swelling of floor of mouth with soreness in throat. As you said that only right side of floor of mouth is swollen and not responding to antiseptic mouth wash. By your this clinical history it appears as you are having either of these- 1- Right sided submandibular sialoadenitis. 2- Ranula. 3- Gingivitis. For confirmation of diagnosis and treatment you are adviced for- a- Ultrasonography of submandibular region. b- Culture and sensitivity of saliva. c- X-Ray OPG. By a thorough clinical examination of oral cavity and their co-relation with inferences of above investigations one may reach to diagnosis and that may be accordingly manage. Regards.