2 weeks after radiotherapy my wisdom tooth has got an infection and crumbling. have had teeth problem for some time since i have had Cancer of left breast and lymph nodes. Have Hashimoto's which does not help. Now.. noticed a red line from my jaw going down my neck, i have some Clarithromycin 500mg in date, do you think it would be a good idea to take them. One or two to start with then twice a day. Its new years eve tomorrow and nothing is open and no advice. Live alone in this part of the country and a pensioner.