Hi, I also use Cayenne in my Sunflower Oil. If I use too much, it makes my gums hurt too. So I cut back and it's better. You didn't say if they hurt aside from using the Cayenne, but if they are, it's probably a good idea to go to a dentist. Surely you can afford one visit for a checkup for oral health? It would be worth it to rule out any obvious problems that might not even be expensive to rectify. He/she might recommend a water pik, or perhaps some other health routine.
You are asking questions and crying out for help. You are on the right track! Just know your answers are around the corner, and in fact right in front of you. Persist.