Sensitivity From a Deep Clean Tooth sensitivity can often be the result of a deep clean performed by your dental practice.To remove tartar and other calcified bacteria from your teeth, your dentist will have to use special tools in a process called scaling How long does Sensitivity last after scaling? After scaling and root planing is completed, you may experience slight discomfort around the teeth for several days and increased sensitivity to hot and cold (and sometimes sweets) for up to four to six weeks duration. This is a normal course of healing.