- [jacelyn] there are also grateful children in africa, cambodia, india, and laos. since it started, room to read has reached more than 1,600 schools, and built 15,000 libraries. libraries filled with books published in the local language. this is made possible by donations of all sizes. including help from american teens. - students throughout america have gotten very involved in room to read with a movement called students helping students. so students pick a goal, they pick a country, and we don't dictate to them here's what you do, here's how you do it. we say here's a menu, you can decide you decide on a project, you decide on a country, we'll tell you how much it's going to cost. and we'll report back to you on how the money was spent. - [jacelyn] it costs $30,000 for room to read to open a school. that's a lot for teens to collect. - [john] what's great about this is that no one individual, probably is going to raise enough money to build a school. but if 20 to 50 or 100 students come together and make it a project they're going to do it together and it's goi

well, jacelyn has the answer. >> you'd think that if you don't brush correctly, you'd just end up with dirty teeth and bad breath -- not true. dr. gerry curatola is a dentist and professor at new york university. hi. >> hi. thanks for having me. >> our pleasure, doc. so, what's one of the problems poor brushing can cause? >> well, as you said, it's more than about dirty teeth -- it's really about getting diseases in your mouth, and not just tooth decay and gum disease, but it could be far worse. >> so, give me an example of how a problem that starts in your mouth can actually cause a problem for your whole body. >> well, studies have shown that diseases in your mouth can increase your risk of a heart attack by 10 times. it can increase your chance of getting adult-type diabetes by seven times. and if you're a young pregnant woman, it can have very bad effects on the term of your pregnancy. >> wow. you know, i'd love to ask you a few more questions, doctor, but i think i'd better go and brush my teeth. see you later. >> [ laughs ] that's a great idea. ♪ >> here's another crazy law that'