(dc) toothache

i have what could only be described as a toothache. i've been wondering if it was real for a few days now (given all my other current ailments), but it's most definitely a toothache. i've never had a toothache (or a cavity) before. it concerns me for several reasons, but mostly because i don't know any dentists in DC. i should go to a dentist right away. does anyone know a dc dentist (a good one)?