As Chaparral was recommended for tooth decay, I got it to cure my tooth ache. I faithfully applied it directly to the aching tooth for several days and it failed to get the job done. Had better luck with oil of oregano. However, if you have cancer, you may wish to consider getting it. According to herbpathy.com, "Chaparral is a good herbal remedy in treating cancer... It stops the cells from becoming Cancerous. It contains an ingredient called Nor-dihihydroguairetic (NDGA) that produces a strong antitumor and anticancer effect."