hi...I have a tooth infection and doctor has prescribed Novoclox LB 500 mg for 3 days (1-1). When I take this for 3 days continuously, it would reduce. But, after 15 to 20 days, I again see the same issue and if I take the same medicine for 3 days, its going off. This has happened 3 times. How safe is taking Novoclox dosage every 20 days?