Here is the short answer, from the people who fit these aligners at Designer Smiles: Invisalign feels like pressure, and pressure is a completely different animal from toothache. It is a tight, dull, slightly bruised feeling in the teeth themselves, it turns up when you put a new aligner in, and it has usually wandered off again while you were busy doing something else.
So, does Invisalign hurt?
Not in the way most people are braced for. There are no wires and no brackets, so the old brace story, the one about a metal end digging into your cheek, simply never happens. What you get instead is tightness: your teeth feel gripped, they feel tender to bite on, rather as though you had been chewing something far too tough for far too long.
And that feeling is the treatment happening. Your teeth are not set in bone like fence posts in concrete. Each root is slung in its socket by a thin ligament, a hammock of fibres, and when an aligner leans on a tooth that hammock is squeezed on one side and stretched on the other. The bone quietly rebuilds around the new position while you get on with your week. The squeeze is the bit you can feel, which is why it aches in the way your legs ache the day after a long walk you had not trained for. Tissue being asked to change tends to mention it.
So the honest version goes like this. Most people say tight. Some say sore for a day. A few barely notice anything at all. Very few people enjoy the first evening of a brand new aligner, and almost nobody is still thinking about it by the third day. If what you wanted was a treatment you cannot feel at all, no method of moving teeth can offer you that, because the feeling and the movement are the same event.
What the first three days are like
The first set is the big one, because nothing in your mouth has done this before, so it helps to know the shape of it in advance.
You leave with the aligners in and the first impression is grip. Everything feels close and snug and slightly foreign, your tongue keeps going back to the edges the way it would to a new filling, and your mouth makes a bit more saliva than usual for an hour or so. By the evening the tightness has arrived properly and biting your teeth together feels like squeezing a bruise. Day two is often the top of it. By day three it is already fading into the background, and by the end of that first week the aligners are just a thing you wear.
Eating is the part that catches people out more than the ache does. The aligners come out for every meal and for anything to drink other than water, which is easy enough, though on the first day or two your front teeth would rather not be introduced to a crusty baguette. Soup, pasta, eggs, anything you do not have to tear at, and you sail through it. Within a couple of days you will be eating normally and wondering what the fuss was.
Why every new aligner is tender, and tightest on the first night
When Invisalign hurts, it is almost always the first evening of a new set. Understand why that is, and you can do something about it.
Every aligner in the series is a fraction different from the one before. So on the day you seat a fresh one, it is not yet the shape of your teeth. That small mismatch between where the plastic wants your teeth to be and where they actually are is the push, and it is at its absolute strongest in the first few hours after it goes in. As the days pass, the teeth travel towards the shape of the plastic, the mismatch shrinks, and the pressure fades with it. By the day before you change, the aligner has stopped asking for anything and feels like nothing at all.
So here is the free trick. Change to your new aligner last thing at night, just before bed. You sleep straight through the strongest few hours of it, and you wake up with the sharpest part already behind you and the aligner properly settled on your teeth. People who change at breakfast spend their morning meeting thinking about their teeth. People who change at bedtime mostly do not notice a thing.
What about the lisp?
Most people lisp slightly for the first few days and then stop noticing the aligners at all, and there is a tidy reason for it. Your tongue makes an s sound by aiming at the back of your top front teeth, and that is precisely the surface the plastic is now covering. Your tongue arrives where it has always arrived, meets smooth plastic where the tooth used to be, and produces a soft whistle instead.
Your tongue is a fast learner though. The cure is simply to talk, which is why the people who lisp longest are the ones who go quiet out of self-consciousness. Read something aloud in the kitchen, ring someone who does not mind, sing along to the radio in the car on the way home. It sounds far more obvious from the inside of your own head than it does to anybody sitting across a table from you, and it sorts itself out within a few days.
What actually helps
Painkillers help, and the first night of a new set is the moment they earn their keep. Whatever you would ordinarily take for a headache, at the dose printed on the packet, taken as you change rather than later on once the ache has made itself comfortable. If you are not sure what suits you, your pharmacist will sort you out in a moment.
Chewies help more than people expect. They are small soft plastic cylinders you bite down on after a new aligner goes in, and they push the tray fully home onto the teeth. An aligner that is not quite seated rests on the tips and edges of your teeth, which concentrates all that pressure into a few small spots and is the usual reason a set feels sharp instead of merely tight. Bite the tray home and the same amount of force spreads across the whole tooth, which is both kinder and more effective. There is also something genuinely pleasant about biting on something soft when your teeth feel bruised, the same instinct that makes you press a sore muscle.
Cold water is the quietest remedy of the lot. Sip it with the aligners in and it takes the edge off almost at once, and unlike almost everything else you might drink, water is welcome in there.
And then the one that feels backwards. When your teeth ache, every instinct says take the thing out for half an hour of peace. Please do not, because you will be buying that peace at a poor exchange rate. Teeth begin drifting back towards where they came from almost immediately, so an aligner left out for an hour goes back in tighter and sorer than it came out, and you will have had the same ache twice. Twenty to twenty-two hours a day is the number your dentist gives you, and the comfortable way to wear them turns out to be the same as the effective way: in, and left in.
Attachments rubbing, and a sharp edge on the plastic
Some teeth need small tooth-coloured attachments so the aligners have something to grip, and they come off at the end of treatment (what attachments, chewies and elastics are for has its own article). They are little bumps, and for the first week or so the inside of your lip is not sure what to make of them. It is exactly the feeling of a new pair of shoes against your heel: a bit of rubbing while everything gets acquainted, then nothing. A scrap of orthodontic wax over the bump gets you through those first days comfortably, and your lip toughens up quickly on its own.
A genuinely sharp edge on the plastic is a different matter, and it is not something to put up with quietly. Aligners are trimmed by machine, and now and then one arrives with a rough edge that catches your tongue or your gum. Ring us on 0121 709 3821 and let us smooth it for you. It takes moments in the chair, and there is nothing whatsoever to be gained by soldiering on.
When it is not the aligner talking
Aligner pressure has a signature: a broad tightness across several teeth at once, worst on the first night, easier every day after that.
So if what you are feeling does not match that description, ring us on 0121 709 3821 and let us have a look. One tooth throbbing on its own, a gum that swells up, or soreness that grows day by day instead of settling, none of those are the aligner doing its job, and they are all much easier to sort out early. That is what the number is for.
Does it get easier?
It does, and for a reason worth knowing: the first aligner is the only one that asks your mouth to learn something new. The lisp, the extra saliva, the strangeness of the grip, the lip discovering the attachments, all of that is a one-time tax you pay in week one and never pay again. What is left after that is the tight day or two when you change sets, sharpest on the first evening, and even that shrinks as the routine becomes automatic. Change at bedtime, chewies in front of the television, glass of cold water, and the whole thing quietly becomes a background feature of your life rather than an event.
By the middle of a case, changing an aligner is something most people notice rather than something they plan an evening around. Somewhere in there your teeth start visibly moving, and that turns out to be a wonderful painkiller in its own right.
If you are weighing it all up and want the practical side, the plans, the timings and what the free consultation covers are on our Invisalign page. The consultation includes a 3D scan of your face and teeth and your own finished smile on screen, and you will have seen exactly what is being asked of your teeth before anything is asked of them.
