You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is The following is/are a rich source of fluoride: and explain in detail?
The dried tea leaves contain 100-400 ppm fluoride, depending on the brand.
Fish products, in particular canned fish such as salmon and sardines have a fluoride content of up to 20-40 mg/kg. The meat of fish is relatively low in fluoride content (2-5 mg/kg) as compared with fish protein concentrates, which may contain up to 370 mg/kg.
Certain plants, such as taro, yams, and cassava, cabbage have been found to contain relatively high fluoride levels.
Essentials of preventive and community dentistry
Soben Peter
5th edition
page no. 243