I hate ulsers, get them all the time esp around my period!!........ I find the gels tend to slip off so i go for anbesol liquid (it's in a little glass bottle) If you can't find any of that then try the anbesol gel as it is alot stronger than bongela and works a treat!!!
Rinstead pastells chewed throughout the day are ok, and corsydyl and oraldine mouthwashes are great!