Filling Me Softly

The Dirty Secret of White Fillings

Dentists are the only people allowed to ask you questions while operating power tools inside your face.

And, like actors in arthouse films, they come with a preference, gold, silver, or white? No, not jewellery or political donors, but fillings.

You sit in the chair, your mouth clamped open like a nightmarish sex toy, and the dentist, peering in like an archaeologist into a pit latrine, asks: “Shall we go white?”

The white in question is the so-called composite filling, dentistry’s answer to make-up: cosmetic, modern, allegedly harmless, and just like all good things that promise beauty, potentially toxic.

Now, let’s get something out of the way. Composite sounds lovely, doesn’t it? Elegant. Scientific. Something you’d expect in a new Boeing wing or a mid-century chair. But what it really means is plastic and glass. Bits of quartz suspended in something called Bis-GMA, a resin whose main claim to fame, other than living rent-free in your molars, is that it is derived from bisphenol A, a synthetic estrogen. A chemical which, according to various anxious boffins, is linked to everything from obesity in toddlers to fertility issues in hamsters. And most contain this other well-known decay-protecting? ingredient called fluoride.

Yes, it makes rats fat. Allegedly. Which is probably less of a concern than whether your teeth fall out before your next Tinder date.

So why the fuss? Well, composite fillings can degrade over time, like actors in soap operas or Labour leaders. They shrink, swell, and form gaps like a post-Brexit trade deal. And in those tiny gaps nestle bacteria, unseen, uninvited, and armed with picks and spades to mine your enamel like Cornish pirates.

Hence, more decay, particularly in the hard-to-brush crevices where even floss fears to tread.

The critics, mostly old-school amalgam enthusiasts with shelves full of mercury, point to this as irrefutable proof that composite fillings are unfit for purpose. They crack, they leak and they age. But then, so do amalgam fillings, just with more heavy metals and less plausible deniability.

And let’s talk about amalgam. That dull, gunmetal-grey plug that turns your mouth into the back end of a ’70s Rover. It’s made with mercury, yes, the very thing your grandmother kept in thermometers and told you to avoid in fish.

Yet it remains in your teeth, locked in like a cursed Egyptian spirit. Still, we’re told it’s safe. By the same people who told us PPI was a good idea and Prince Andrew was just misunderstood.

But amalgam has longevity. It’s hard. It lasts. Like granite or gout. It survives curry, claret and marital disappointment. It doesn’t shrink but swells. The mercury, allegedly, doesn’t escape, unless you breathe, chew, have saliva, clench or grind, have other dissimilar materials in your mouth, smoke, have a hot cup of tea, brush your teeth, have a hygienist appointment, …

So what to do? Replace grey with white and risk allergic reactions, dental failures, and the quiet horror of knowing your filling contains something that made a lab rat infertile? Or keep your old amalgam plugs and risk long-term mercury exposure, shame at the dentist, and looking like you floss with car parts?

The answer, of course, is ceramic inlays. The Rolls-Royce of fillings. Sculpted by hand (well, machine-guided hand) by a dental technician with more qualifications than your GP, baked in a kiln, and inserted with reverent precision.

It’s expensive, bespoke, and invisible, but it doesn’t shrink, doesn’t leak, and won’t leach endocrine disruptors into your bone marrow. It is the dental equivalent of bespoke shoes: elegant, durable, but not available on the NHS.

Still, if you must go composite, and many do, all is not lost. Today’s formulations, we are repeatedly reassured, are better. More resistant to abrasion, less prone to leakage, and increasingly available without the dodgier chemicals. Apply in layers, keep your teeth clean, stop gnawing on pen lids, and you may well have years of silent, unobtrusive dentistry.

So here’s the epilogue: white fillings are no longer simply vanity’s plaything. They are improving. Like oat milk or Britain’s Eurovision entries. But proceed with caution. Ask questions. Read the label. Be that annoying patient who says, “But is it BPA-free and fluoride-free?” as if you were choosing yoga mats.

If your dentist rolls their eyes, you’re doing it right.