actually,Tuberculosis of the lung is usually associated with a dry cough
that eventually leads to a productive cough with blood-stained sputum. so, you can observe some day later, it leads to sputum production or not.if sputum not produced, it is not TB.it may be some others possibilities such as allergy
Among published studies involving DOTS treatment, the rate of recurrence ranges from 0-14%. In countries with low TB rates, recurrences usually occur within 12 months of treatment completion and are due to relapse.In countries with higher TB rates, most recurrences after appropriate treatment are probably due to reinfection rather than relapse.
if sputum produced, you should back to your doctor to examine your sputum to find gram negative bateria of Mycobacterium Tuberculosis
.but i think mostly and commonly TB can be cured well.