Scaling is not once in a lifetime procedure. It only removes the hard deposits called as calculus which your toothbrush cannot remove. The plaque which leads to calculus formation and gum inflammation and bleeding starts forming in the next hour itself. So post operative maintenance by the patient is equally important if not more. You can consult another dentist and describe the situation to him or her. After the procedure of scaling your dentist will also describe you the proper method of brushing the teeth. Long term results will only and only lie in your hands depending on your compliance.  Regards.