When people experience throbbing in their teeth or gums, they have serious dental problems, and if a dental problem is serious, it will be a problem either of tooth decay or of gum disease
Ttherefore, since throbbing in the teeth or gums is a sign of serious dental problems, and neither Sabina' s teeth nor her gums are throbbing, Sabina can be suffering from neither tooth decay nor gum disease
If a person is interested in either physics or chemistry, then that person would be wise to consider a career in medicine. Yolanda, however, is interested in neither physics nor chemistry, so it would not be wise for her to consider a career in medicine.