Hello, regarding the gum recession, pls get an xray done to check if the source of it is internal.
In case it is only external, then change the brushing pattern make it rounder with a soft bristle brush.
Also when u apply stolin, massage the lower gum upwards and upper gums downwards for growth in the black triangles. It is a very slow process but does happen in a few cases
Next Steps
Keep the area extremely clean so that nothing sticks in the space and allow the gum to be healthy for regrowth. The flouride stains can be covered with a tooth coloured filling material
Health Tips
Get an xray done