It is just like a diagram showing how easily particles fall off. Actually if you don't need to scrape, many tiny particles have been already over there. You can study it by yourself if you are interested in. Maybe the diagram is stupid a little bit but not very much.
If anyone has any doubts about this report, please try it by yourself. The report is UWELL's opinion based on taking care of your health. UWELL also waits for the study from the third party or authorities, even the information from ceramic coil provider, they should have done it before.