But what we didn’t know was Liam’s back teeth have been pretty sick of Liam as well.
And his front ones weren’t too keen on him either.
The 38-year-old snaggletoothed Manc, who is currently promoting his new band Beady Eye, was ordered by management to get himself to a dentist – and pronto.
Several hours of heavy-duty drilling later, and the singer emerged, puffy-mouthed and dribbling slightly, with a brand-new Hollywood smile. A snip at £7,000.
I’m told: “Liam wasn’t quite at the Shane MacGowan stage but his teeth were pretty dodgy.
“Beady Eye is a big deal for Liam and he felt under pressure to look his best for his musical comeback.
“He knows his teeth have never been his strong point, so he decided now was the time to get them done. Liam had a place recommended to him, and booked in for a consultation. A few weeks later, he went for it, having his grey fillings replaced with white ones, and some veneers put in for a more even look.
“His new gnashers are a lot more American-friendly too so if Beady Eye do try and conquer the States, at least it won’t be his awful teeth they’re talking about.”
Nope, just the music, then. While the new molars aren’t quite Simon Cowell-esque, they are, as our pictures show, a marked improvement.
Of course it’s not the first time the star has had dental work.
Nine years ago, he had emergency surgery to repair his two front teeth after he was smashed in the mouth in a bar in Munich. And he’s not the first in his family to undergo cosmetic dentistry procedures.
His brother, with whom he is no longer speaking post-Oasis fall-out, has already had his pearly whites sorted.
So if they do ever meet up, they can just bare their teeth at each other. That’ll be one seriously blinding evening...