Dental Cleaning & Sensitivity along gumline?!

The sensitivity is caused by a condition called exposed dentin or gum recession. Dentin has little holes that lead to the nerve center of the tooth. Brushing with a desensitizing toothpaste, will lay down minerals that travel down the holes (or tubules) and creates a barrier around the nerve and, with regular brushing, builds long lasting protection. A desensitizing toothpaste like Sensodyne works at the source of the pain to calm and sooth the nerve and is clinically proven to relieve the pain of sensitivity.
Gum recession caused by toothbrushing is not the same thing gum disease, which is caused by bacteria and infection. This recession is caused by you. You have brushed too hard, too frequently, with too much force, too much on the gums, for too long, and now it is too late, your gum has disappeared. Maybe you pushed too hard because you were stressed or not paying attention. No matter what the reason, once the gum is gone, it is gone and it “‘aint ever gonna grow back”. You have receded gums and- you’re (gasp!) only 25, or 30 or 35 or whatever and you thought all your life that gum recession was only a problem for “old people”. As you can see, if the cause of the recession is toothbrushing, it can occur at any age, young and old.
To treat a deeper notch, the treatment consists of a filling, usually of tooth-colored filling material applied directly to the notch to fill it in. This not only gives the tooth its correct contour back, but it covers up all exposed dentin, shutting off any sensitivity.

10 years dental experience
http://www.drbirnbaum.com/Ronald%20Birnb…

Let your dentist know about any sensitivity you may have to your teeth or gums. He will decide if you have gingivitis and tell you how to prevent it. He should ensure that your teeth are cleaned properly so that you feel very little pain.