Sir
Sensoform is a gum paint which is used in treatment of spongy or bleeding gums and it contains tannic acid. It doesn't decreases sensitivity of tooth and anything in excess is always harmful.
Don't brush your teeth with more power by doing this you are damaging your teeth and will increase sensitivity eventually.
Use soft or extra soft toothbrush for brushing. Change your toothbrush after every 45 days.
Next Steps
If problem persists then visit your dentist with prior appointment
Health Tips
Use any desensitizing tooth paste.