Could doxycycline hyclate help abscessed tooth?

Not good idea: First of all Doxycycline is the wrong spectrum of antibiotic for aril use. Second, and most important, antibiotics do not cure abscessed teeth. The drug is used to control the severity of the infection, but antibiotic will not eliminate the infected tooth material. That has to be done with decay removal, root canal treatment, and/or extraction. Please see a dentist for rx.