Hello
Mild pain during a splint and orthodontist treatment is quite normal.
If the pain is intolerable you are advised to visit your dentist from whom you are taking the treatment.
Massaging is not harmful but donot massage with lot of force.
You will not be able to know weather the treatment is working. A clinical checkup is recommended for the same
Next Steps
visit your dentist if pain is beyond control
Health Tips
do salt water gaurgle 4-5 times in a day.
Incase of too much pain you can use ice packs for temporary relief