Teeth sensitivity and pain improved with adjusted brushing routine

After 2 weeks using 4-6 drops 28% solution + 3-4 drops 50% citric acid + 2 Tbsp (30g) normal water 2-3x daily and brushing gently with a soft brush: my teeth are not so yellow and 2 gaps where fibrous food often got stuck + fermented are healing.

However, 2 or 3 areas on the gums have become very sensitive when brushing and 2 or 3 teeth have become so sensitive that when I brush the areas, it feels as if the solution is hitting a nerve. Moreover, now these teeth REALLY hurt when I eat anything not soft (e.g. peanuts, crackers, raw apples). If I persist the pains somewhat diminish.

I found one entry with a possible solution (posted below) but are there other suggestions?

“For the problem of acidity when brushing with activated mms, I do a normal activation with 1/4 teaspoon mms + citric acid, add water after 20 seconds, then add another 1/4 tsp of mms. This causes the whole solution to taste salty and yet retain all the chlorine dioxide. I brush with this after brushing with soap, works real good. Before I did this and added the second dose of the mms, my teeth would become very sensitive from the acidity of normal activated mms. Add the second dose after activation and the problem goes away.”