理解性阅读 回到一句话的，半小时22本，很快就指完了 There are five stages for your tooth growth, when you are a baby, around 6-12 months, you will have two upper teeth and two lower teeth. Then when you grow up to 9-16 months, you will get four upper teeth and four lower teeth. When you are 13-19 months, you will four more teeth, then you have 12 teeth in total. When you are 17-23 months, you will get 8 upper teeth and 8 lower teeth, 16 in total. When you are 23-33 months, you will get 20 teeth, 10 upper teeth and 10 lower teeth. <br>The 20 teeth are your primary teeth, the children at 6 years old, you will begin to lose these teeth and get your new teeth, the secondary teeth, this process will last around 6 years, and finally you will have 32 teeth just like mom, these teeth are your secondary teeth. It is marvelous. <br>Look at this picture, there are so many teeth, they look different and have different functions, these four green teeth are incisors, which help you bite tiny food from a bigger one, then the two orange teeth are canines, they are sharp, and help to support our mouth to make the mouth looks better, then we have yellow teeth, they are premolars, and blue molars, they help us to chew and grind the food. <div>口腔博物馆之后继续巩固口腔系列</div><div>what is good for your teeth?<br></div> 开始了解月相