Class 4 Science
Class 4 have been learning about fair tests and investigating how long they need to brush their teeth for. To make this a fair test, we used the same tooth brushes and tooth paste but we changed the length of time we brushed them for. We predicted that the longer we brush our teeth for, the cleaner they will be.
Our results show that if you brush your teeth for less than 2 minutes then your teeth will still have bacteria on them but if you clean them for 2 or more minutes then they will be clean. We were surprised to find that the children who cleaned them for 2 or 3 minutes had the same results. As long as we are brushing our teeth for 2 minutes then our teeth will stay healthy.