Light a green or orange candle and call for good health 
Write down “Healthy teeth” on a piece of paper and follow the steps to make a sigil.
Once you have your sigil ready, meditate over it as you visualize your healthy shining teeth. A cluster of Analcime could be a fitting addition to the spell.
Keep visualizing the sigil with the eye of your mind, and everytime you start thinking about your teeth draw it in the air with your index finger.
Keep in mind that spells cannot replace a visit to your dentist. Blessed Be! 