I have a tooth that has turned a bit grey in color and somewhat concerned there is no pain or discomfort how urgent is it that i have it checked by a dentist (just concerned with the risk for covid exposure)?

Past tooth trauma?: This does not sound urgent. However, many dentists can still be reached telephonically even if they are doing routine in-person care.

Grey tooth: There are a few possibilities: If the tooth has a large silver filling the color may have darkened over time. If the tooth's nerve has died to color can aloo turn grey. No pain = no emergency. As soon as your dental office is open for regular business have the tooth evaluated.

Not Covid: Caused by trauma at some time in the past. It's like having a black-and-blue mark inside the tooth that will not fade. See your Dentist for cosmetic care.