From what I conprehend you may have underwent a scaling procedure where the doctor have removed plaque and stains from your teeth. That is one but not the only method to improve oral health. Following good oral hygiene methods at home plays an equally important role towards getting strong teeth. Stopping any debilitating habits like smoking or chewing tobacco, betel leaf or nuts(Paan supari) if any, brushing twice daily after meals with tongue cleaning, using a medicated mouthwash and avoiding coarse or very hard food will also help in achieving your goal of strong teeth in future.