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 tobacco preparation mainly used to clean the tooth is: and explain in detail?
Mishri/Masheri :

It is prepared by roasting tobacco on a hot metal plate until it is uniformly black. It is then powdered, it is used with or without catechu. 
Catechu is a residual extract obtained by soaking the heartwood of the tree Acacia Catechu or Acacia Suma in boiling water. 
It is used primarily to clean teeth.

Soben Peter 
Essentials of preventive and community dentistry 
4th edition