If teeth are hurting, reducing inflammation makes sense? Look into an anti-inflammatory diet - it often contains many veggies and most fruits. Unfortunately, a child may need some inspiration to ingest healthy raw foods. Try to avoid many pesticide ladden foods or wash them really well, and peel.
There's some confusing articles about strontium. The scare started when the radioactive strontium flew up into the atmosphere from nuclear bomb detonations and then settled on top soil of growing plants. As the plants absorbed this radiated strontium, people became sick and gave the trace element a bad name.
ChrisWhewell, what is your source of Strontium? Dose? Frequency? Cofactors?