
Unlike your heart or brain, your teeth weren't ready to work from the day you were born. Although babies have the beginnings of their first teeth even before they are born, teeth don't become visible until babies are about 6 to 12 months old.
After that first tooth breaks through, more and more teeth begin to appear. Most kids have their first set of teeth by the time they are 3 years old. These are called the primary teeth, baby teeth, or milk teeth and there are 20 in all. When a child gets to age 5 or 6, these teeth start falling out, one by one.
A primary tooth falls out because it is being pushed out of the way by the permanent tooth that is behind it. Slowly, the permanent teeth grow in and take the place of the primary teeth. By about age 12 or 13, most kids have lost all of their baby teeth and have a full set of permanent teeth.
There are 32 permanent teeth in all — 12 more than the original set of baby teeth. Most people have four teeth (called wisdom teeth) grow in at the back of the mouth when they're between 17 and 25 years old. These complete the adult set of 32 teeth.
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P.V. Sindhu represented India at the 2016 Summer Olympics, becoming the first Indian badminton player to reach a final. She won the silver medal after losing out to Spain's Carolina Marin.
Along with wrestler Sakshi Malik, who won a bronze on Aug. 18, Sindhu is so far one of the only two medalists in this year’s Indian Olympic contingent, the largest the country has ever sent to the games. She’s also the youngest Indian to ever win an Olympic medal.
Her epic performance in Rio comes after years of training under 2001 All England Open Badminton champion Pullela Gopichand. Sindhu, who comes from a family of volleyball players, began playing badminton at the age of eight after discovering the sport by chance. Since then, she’s spent almost all her time training at Gopichand’s academy in Hyderabad. Over the years, she’s won medals at several domestic and international competitions, including a bronze at the 2013 World Badminton Championships in Guangzhou, China.
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