Ask a proper dentist, not the trolls on here
You might be interested in "deep cleaning" prior to any brightening....a semi-brutal affair which involves clearing all the debris which has accumulated between the railings.This is achieved with metal sticks with hooked points and a lot of pushing,dragging and scraping.Its a bit rough,but so worth it.The outcome is that you can get a micro brush,like a mini bottle washer,between all your teeth. Feels and looks good. Its amazing how much calcified rubbish is clogging your teeth,and the only way to remove it is by force.I had mine done in Bangkok,took a couple of two hour appointments to get it sorted.Been clear ever since too. Place was Bangkok Dental Hospital on Sukhumvit Soi 49 if anyone is interested,an amazing state of the art place like a seven star hotel.Prices unthinkably cheap compared to UK alternatives.They also do all other dental procedures. Might be cost effective to fly out there,take a holiday,pay for a first class service and still save a few bob on UK prices.
In fact Bangkok is a useful destination for any medical treatment...the Bumrungrad hospital is one of the worlds most modern,and makes the NHS look medieval. Top doctors,low prices,instant service. I had some surgery done at the Wellington in St Johns Wood too...Londons finest....but its certainly not as modern or technologically advanced as Bumrungrad.
There are dental hospitals all over Bangkok...and Pattaya too if you fancy some excessive r'n'r while you are out there.
Oh yeah,and you should ditch the smoking too....shiny white teeth are an amazing confidence booster,seems a shame to turn them brown with coffin nails.
That's all very interesting - but the name of the hospital Bumrungrad! Would make me ever so slightly nervous
Sounds like somewhere you go to get your piles seen to.