I have had a lip ring for about six months, and recently after having taken it out, my bottom front teeth are extremely sensitive to pressure. When I fully close my mouth, my top teeth resting against the bottom creates a stabbing sensation which feels like my nerves are exposed. However, there is no visible pulp or obvious enamel degradation.
Thanks for your query, I have gone through your query. The sensitivity can occur secondary to the receded gums or attrition or abrasion of the teeth. The other possible cause can a crack in the tooth. Since you are telling the upper teeth are resting on the lower teeth, there can be attrition secondary to deep bite. Consult an oral physician and get it ruled out. If I am your treating doctor I would have suggested you to take desensitizing toothpaste like strontium chloride(sensor or lanolin), Use twice daily for a month. If it is because of receded gum, you need to get your teeth cleaned. If it is secondary to abrasion, then the teeth has to be restored with filling material. If it is secondary to deep bite, then the deep bite has to be corrected orthodontically. I hope my answer will help you, take care.