Seeking your suggestions, please help!!!

Hello friends,

My cousin brother got a bad habit like, he used to take coffee, smoking, red wine etc. As a result he had got a shameful problem. Even I also hate his smile because, when he smiles, it seems creepy. His teeth got strangely stained. Now he is ashamed of being among his friends. Now he is feeling regretted. I advised him to leave all the bad habits, and I Googled for its solution and consulted him to use teeth whitening products from pro teeth whitening world. It seems very cost effective. Because one can survive without having a smile.

If you have more knowledge economic teeth whitening product or any other remedy, please suggest.

Thank you,
Robin Hood.