May I drink water just after talking tea? Will it harm my teeth? How can I make my teeth very strong?

It is not about the tea and water. You should always avoid extreme hot and cold combinations. But I will suggest you to rinse your mouth with water after taking tea (after 5 minutes. Otherwise suger content of tea me cause to increase bacterial load in mouth. To keep your teeth strong brush twice a day but in a proper manner. Avoid very sticky food. If can not avoid then at least brush your teeth after consuming such items and visit your dentist every 6 months.

You can drink water after some time immidiat change after hot to cold give you pain sensation in your teeth for making your teeth strong regularly brush twice daily use mouth wash and dental floss.

Yes if u wish, brush ur teeth twice daily massage gums