Hi...
If it Is a primary (milk) teeth it can be removed, As usually milk teeth falls off by the age of 8yrs
If it is an permanent teeth it has to be preseverd doing root canal treatment
First and foremost is to take X-RAY(IOPA)to rule the cause
Next Steps
kindly visit nearby dentist as soon as possible for futhur management
Health Tips
avoid self mediaction ,medications give only temporary relief