Irregular brushing technique with a worn off brush will certainly cause the tooth abrasion, gums to recede & thereby resulting in root exposure. Exposure of (dentin or cementum) layer of the tooth or trauma to the root nerve tissue causes Sensitivity. Adv cleaning and artificial
enamel filling Floss all your teeth inter dentally & brush twice daily, morning & night, up & down short vertical strokes, with ultra-soft bristles, indicator brush. Tooth brush to be changed every 2 months.