Why is my tooth turning gray? what do you suggest?

Dead pulp?: If your tooth or mouth in the vicinity of that tooth ever experienced any blunt force trauma then the tooth pulp may have died. The color change is due to hemoglobin degradation of the red blood cells within the pulp leaching into the dentin of the tooth. This is similar to getting a bruise on your body. The only difference is the tooth will stay that color. This is easy for a dentist to confirm.

Trauma: You may have had a bump or had your tooth hit hard and the nerve was damaged. You need to see a dentist for an x-ray and exam. The dentist can then help you determine the course of treatment.

Consult: There are many things that can make a tooth turn gray- decay, amalgam staining, trauma to the nerve, external staining, etc. See a dentist to determine the exact cause in your case and what if anything can\should be done.

Dental checkup: My colleauges have provided you with accurate and absolutely correct advice. The only thing that i might add, is this: have any questionable tooth or mouth concern evaluated on 'your' terms. Rather, than waiting until your tooth dictates to you when you need help. Iow, don't wait for dental pain to let you know when to have it checked.