Charming, enthusiastic young dental hygienist makes me promise to do a whole bunch of things to improve my gums. She tells me to rub this special oxygenated gel on every night. I agree to all of it — she is so earnest, cares so much!

Get to the receptionist, tells me the cost of the cleaning, says the gel is extra. How much? 40 euros! Asks if I still want it. Tell her no, but just don’t tell the hygienist!