You CAN get high quality dental treatment abroad FACT.
However I would only ever recommend getting it done in countries such as north america, canada, australia etc..
Note the obvious immediate problem, it will probably cost the same or even more than in this country, there are several GOOD reasons for this.
Remember as with all dental/surgical treatment there is NEVER 100% gurantee of success (not possible/NEVER will be). However if you have problems here in the UK its going to be easier to have managment here in the UK.
Just because Bob the butcher who you know very well went abroad and had 'fantastic' dental treatment doesn't mean you will.
Also unless you have outright failure (especially with dental implants!!!) you won't necessarily be aware of 'success' or failure for a few years.