Dotted around central London, you can pop in at your lunch break to get a 20-minute clean and polish, plus a check-up to see if you need any fillings etc, which the fully trained dentists can also do for you.

This is the cheapest cleaning option at £49, but to really get your gnashers to their natural whiteness, upgrade to the £89 diamond polish. I practically ‘ting’ every time I smile now.  

Bank and various locations  
Tube | Bank

Photo: Thinkstock