Hello, Welcome Thanks for consulting HCM, 
     I have gone through your query,  you have mentioned that you have difficulty in swallowing saliva, dont worry it can be due to  
Tonsillitis, 
     You can take medications for that One Tablet 
Cefixime 250mg twice daily,  One Tablet 
Cetrizine twice daily,  One Capsule vitamin B complex once daily for three days
    Do warm saline gargle two - three times a day 
    For Orthodontic treatment you are taking , you should consult your 
dentist , and get it checked that for sharp edges , 
    If problem continues then consult ENT surgeon. 
   Hope this will help you.