That is a horrific story actually Like something from a horror film.
The worst 'revenge' I would commit, would be to drop all his keys to his flat and car down the drain, or run up a massive bill on his phone...I wouldn't even smash his precious possessions (like old records or collectibles or whatever... )
That said, I think that the best 'revenge' as Trisha Goddard said once, is success... In other words, for you to get on with your life, and be happy and successful, and maybe even meet someone else and let him see how happy you are WITHOUT him. But I WOULD feel full of glee if I heard the woman he left me for had dumped him and he was alone...Who wouldn't?!
But THIS? This is horrendous, and IMO, is only marginally less disturbing than if she had removed a limb. This is just ghastly. So YES Renton, she DID go to far, and imo, deserves to go to jail for several years for this, and if she is a dentist, she should never be allowed to practice again.