Sir
Sensitivity of teeth can be due to multiple reasons
1. Attrition (wear of teeth )
2. Cavity
3. Occlusal disharmony ( due to any recent prosthesis)
4 abrasion ( caused by faulty toothbrushing etc.)
And if you feel that you can't put enough pressure on any particular tooth than it has to be examined by your dentist for either dental caries or any periodontal problem.
Next Steps
visit your nearby dentist to get the final diagnosis and treatment can be planned accordingly.
Health Tips
try not to delay the treatment as "a sticht in time saves nine"
regards