Year 3 + 4 – Tooth Brushing + Decay Investigation

As part of our Burps, Bottoms and Bile topic in Creativity, we have been looking closely at how our mouths work as the first part of the digestive process.


We have identified the different types of teeth in a human mouth and investigated their function.  Did you know that Canines and Incisors are narrow and pointed to rip and tear foods such as meat into smaller chunks, whereas Molars are wider and flatter to crush and grind food so that we can swallow it more easily?


Using this information, we then researched how we can protect our teeth from decay caused by sugary foods, and investigated how regular brushing for 2 minutes can prevent our teeth from rotting and going brown/black.  To do this, we brushed our teeth carefully and then chewed a plaque disclosing tablet, which showed any plaque still left on our teeth that can cause decay.


Afterwards we checked our partner’s teeth using mirrors – by looking inside our mouths at the colours left by the tablet.  If the plaque we could still see was pink – it was older and been on our teeth a while, but if it was blue/purple, then it was newer plaque that needs to be removed by brushing our teeth more often.


Using our observations, we wrote down any advice from our partners about areas in our mouth that we need to brush better, so that we can improve our own oral hygiene in the future.