Idea for reluctant toothbrushers

E has to have orthodontic work soon but must have ultra clean teeth first. He isn’t reluctant to clean his teeth but is not very thorough and I can only supervise evening brushing as I leave for work while he is still eating breakfast. 
The dentist suggested disclosing tablets for practising getting all areas clean and it’s turned toothbrushing into a great science experiment! From a sensory point of view they’re ok and he loves the ghoulish purple “fake blood” effect Slight smile

Thought I’d share in case it helps any reluctant toothbrushers with getting into it as it helps to show the importance of good brushing.