Recipe Goldmine contributor, Shivani, suggests your choice of the following flavor additions:
Essential oils:
Anise
Coriander
Fennel
Sage
Citrus (only if organic as a lot of pesticide used on citrus crops)
Rosemary
Tea tree (antibacterial)
Myrrh powder is good in tooth powder...antibacterial...good for pyorrhea.
A bit of powdered cinnamon is ok, but go light as it's very zingy and can be irritating to skin and membranes. The same with ginger and clove. People who suffer from inflammation should not use clove, cinnamon or ginger.
Anise and fennel are the best bet all around. Very safe and tastes nice.
Sage (either essential oil or powdered) is good for gum infections.