I was wondering if there is any points at all that can make the teeth stronger, raise the defence from decay or something along the lines. thanks
In TCM theory, the teeth have a strong correlation to the strength of the Kidney system. The Kidney system influences the teeth, bones, hair, nails, etc. Chronic problems with the teeth may indicate a Kidney Disharmony such as KD Qi and/or Jing Deficiency.
The article linked to above has the most common Kidney disharmonies and related treatment points.