I have always had sensitive teeth and gums. The best things I’ve found is just sensodyne and a Phillips sonicare toothbrush. Also flossing is key for my gums. I always ignored the dentist growing up but my gums just got so uncomfortable in my early 20s that I decided to commit to a good routine, including nightly flossing. The first week or two you may get some bleeding and feel initially more uncomfortable, but now I swear both my teeth and gums feel WAY better. Seriously never better!