Use neem leaves, make a fresh paste; add table salt and Haldi (turmeric) powder rub your teeth and make a mouthwash with warm water using paste (you may avoid salt but turmeric is mandatory). Use it regularly if you have a breathing problem. This will work as an oral treatment for breath, teeth, smell, etc. If not daily, then try two-three days a week.
PS Wash the leaves properly before making the paste, fresh and clean paste will be better for it.