5 fun facts about tooth

Here are 5 fun facts about tooth

• We spend an average of 1920 hours brushing our teeth in a lifetime.
• A shark’s tooth falls out and rises again. A shark grows a total of 30,000 teeth in its lifetime.
• At the age of 6, a human child has 52 teeth. But most of it is hidden inside the skull. When one falls, the other begins to rise.
• Acids released by bacteria mix with tooth enamel and cause tooth decay.
• The ideal brushing time is two minutes.