There may be the chances  of tartar deposition because of that u r facing problems like sensitivity, bleeding of gums n inflammation of gums I. e swollen gums.  Either u r using a very hard brush in a forcefull manner which leading to the removal of  enamel layer thus causing sensitivity of teeth. n may be having irregular teeth because of that u r not able brush properly ur teeth that leading to deposition of tartar n thus gum bleeding. For this must visit to ur dentist for scaling I. e cleaning of ur teeth