These medicines n mouthwash are only useful after proper cleaning is done. N their is little crowding seen in lower front teeth. So in these areas stains can accomulate more easily.
Next Steps
(-) Visit a dental clinic or video consult
(-) You need a proper cleaning n polishing done
(-) Use mouthwash or simple warm saline water rinses
(-) Brush twice a day to improve oral hygeine
Health Tips
It's better to visit a clinic. as all these can give you temporary relieve but after proper cleaning of your teeth, you can see improvement