If you’ve landed here because you ordered Dexcom patches and they didn’t fit your sensor, I am incredibly sorry. That is an intensely annoying discovery to make when you’re already burning mental bandwidth dealing with the daily grind of Type 1 diabetes.
The good news is that you haven’t done anything wrong. The Dexcom G6 and Dexcom G7 are fundamentally different pieces of hardware, meaning their overlay adhesives are not interchangeable.
This guide breaks down the physical footprint changes between generations, helps you identify your exact sensor, and ensures you get the correct patch for your Dexcom delivered to your door without the guesswork.
The Dexcom G6 (left) vs Dexcom G7 (right) side by side. The size difference is real – and it’s exactly why the patches aren’t interchangeable.
A lesson in ordering the wrong gear
The G7 arrived in Australia in early 2025, and I switched to it because it was ultimately the newest and smallest device on the market here at the time. I was excited to try it out.
Part of running Not Just a Patch is being deep in the research and development of new patches, and size matters. We want to make sure our patches are designed to be appropriate by device. The Dexcom G6 patch, as you’d expect, is larger than the G7 patch.
I, being the somewhat absent-minded CEO-founder type that I am, have occasionally chosen the wrong patch when ordering from our own website – just like I’m sure some customers have. I’ve received a pack of our G6 patches in the mail, realised the size difference immediately, but needed protection for my Dexcom G7, so I applied the G6 patch. It did the job. But it’s just way, way too big.
I’m an aesthetically minded individual – which is a good thing when you’re building products people wear on the outside of their body. But it also means that if I’ve got a G6 patch on and I’m wearing a G7 sensor, I have this constant brain chatter reminding me that I’ve got a big patch on a very small device.
We work hard on the website experience because we want to make sure other absent-minded people like me get guided to the right patch for the right device. But no matter how good the UX gets, there will always be the occasional mix-up at checkout. Which is why we’ll always send out the right patches in exchange at no cost. Customer satisfaction matters — full stop.
Why your Dexcom generation alters adhesive geometry
Sitting on a shelf, a Dexcom G6 and a G7 patch look like twins. They use the same medical-grade material and the same hypogenic adhesive base designed to stop early sensor failure.
However, they are engineered for vastly different skin footprints. The cutout windows use entirely distinct edge geometry to map around differing sensor housings.
If you try to slap a mismatched patch on, it won’t just look sloppy. It will overlap the plastic edge of your sensor, trap sweat pocketing beneath the weave, and cause the entire unit to peel off days ahead of schedule.
Here is exactly the difference between Dexcom G6 vs Dexcom G7 patches and how the adhesive designs differ:
| Patch Feature | Patches for Dexcom G6 | Patches for Dexcom G7 |
|---|---|---|
| Adhesive Footprint | Large, elongated oval shape designed to anchor a wider surface area. | Compact, circular profile – roughly 60% smaller to match a minimalist design. |
| Center Cutout Geometry | Features a specialized, wide window to clear both the sensor pod and the raised, reusable grey transmitter. | Features a precise, ultra-low profile circular window tailored to a single, integrated unit. |
| Wear Profile On Skin | Designed to accommodate a higher-profile device that sits proud of the skin. | Engineered to sit tight and flush against the body, minimizing clothing snags. |
“Before ordering any CGM accessories after switching devices, I encourage patients to first confirm exactly which device they’ve been prescribed. One of the first questions I recommend asking is: “Do I need a different overpatch, or can I use one from my older device?” The answer – as this article explains – is that the patches are not interchangeable. An overpatch designed specifically for your device, worn consistently, protects your sensor and supports the kind of continuous wear that improves blood glucose management over time.
In my experience, patients receive little guidance when switching from the Dexcom G6 to the G7. Most doctors prescribe based on insurance eligibility, and patients collect their CGM through a pharmacy or durable medical equipment company – often without any educator involvement at any stage. Many receive no formal instruction with their initial device, let alone when they upgrade to a newer generation.
When a sensor lifts early, there’s a gap in glucose data that matters clinically. The patient returns to finger sticks, checks for ketones if needed, and needs to contact Dexcom for a replacement sensor. For people using automated insulin delivery (AID) pumps, the impact is even more significant – these systems rely on continuous CGM readings to adjust insulin throughout the day and night. Missing that data creates uncertainty, raises stress levels, and can allow blood glucose to climb in ways that, left unaddressed, require hospitalisation.” Lilly Mees, LMSW, CDCES Owner, Stepping Forward LLC – United States
My Personal Checklist for a Perfect Application (Every Time)
Getting the patches right the first time? It’s a bit of a fallacy. Depending on which patch we’re talking about, it might take two or three attempts unless you’re lucky or particularly skilled. Sometimes it can take a little bit of practice just to get familiar with working with these patches.
Certainly, they will stick the first time, but I can be pedantic. I don’t want to see any little creases or raised areas in the patches, so my goal is a perfect patch every time. After doing this for over 7 years, here are the main habits I rely on to get it right:
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Use a Mirror:
Getting a second person to help is always going to be a little bit beneficial, but besides an extra person, the best tool is a mirror. Take a little bit of care, and just take it slow.
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Respect the Bonding Period:
What you do after you put it on is just as important. I definitely don’t put a new patch on if I’m about to go out for a run or if I’m about to go for a swim. You’ve heard us say it time and again: the bonding period is important. Our solvent-free adhesive is exceptional, but it gets better and better if you can allow some bonding time with the skin—at least an hour, ideally two. This will ensure a good-looking, long-lasting patch for 15 days or more.
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Don’t Fear Trial and Error:
We’ve all wasted the odd patch or two. The times that getting it right matters most to me are if I’m about to do an instructional video or a photoshoot. We want the patch looking perfect, so we will continue to try patches until we get it as right as possible to capture it in the best light.
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Built for Flexibility: The Non-Stick Center
Applying a patch is somewhat automatic for me now, but I still take a lot of care. It’s also why one innovation we introduced to this market was the non-stick middle section of the patches.
Not Just a Patch CGM patches for the Dexcom G6 (left) vs Dexcom G7 (right). Same quality, different geometry – each cut precisely for its device.
This unique innovation introduced by Not Just a Patch means that we aren’t stuck. We can change our patches as often as we like, with no interruption or difficulty with the CGM, and zero risk of accidentally removing the sensor. It gives you the flexibility to try again, or change the patch on a whim if your mood or fashion choices ask for it.
Protecting that data stream means choosing the exact custom cutout built for your hardware. If you are using the older configuration, look at our dedicated Dexcom G6 patches; if you’ve updated your tech stack, choose our water-ready Dexcom G7 patches.
FREQUENTLY ASKED QUESTIONS
Do Dexcom G6 patches fit the G7?
No, they don’t. The G6 and G7 are entirely different pieces of hardware. The Dexcom G6 patch features a much larger cutout window designed specifically to wrap around its bulky, two-part sensor-and-transmitter housing. If you try to stretch it onto a smaller, all-in-one G7 sensor, the hole won’t align, sweat will get trapped under the loose fabric, and your adhesive setup will fail. You need a cut engineered precisely for your generation.
How do I know if I have a G6 or G7?
The quickest way to check is to look directly at the plastic on your arm. If your setup has a separate gray transmitter pod that you unclick and save every 90 days, you’re using a G6. If the whole device is a single, integrated piece that gets tossed in the bin at the end of your session, you’re wearing a G7. If you’re still in doubt, just open up your Dexcom smartphone app and look under your profile settings.
Can I use G7 patches on the Dexcom ONE+?
Yes, absolutely. The Dexcom ONE+ shares the exact same physical housing and footprint as the standard G7, meaning our G7 patches will map onto it perfectly. However, if your doctor has started you on the newer Dexcom Stelo line, drop us a message first to confirm compatibility before you hit the checkout, as device profiles across newer lines can differ slightly.
Why did my patches stop working when I got a new Dexcom?
The most likely culprit is a sudden prescription update at the pharmacy. It’s incredibly common to get bumped up to a newer device generation without anyone giving you a proper breakdown of how the hardware actually changes. Your current overlay adhesives aren’t faulty—they are simply cut for an entirely different geometric blueprint. Grabbing the correct generation will instantly sort out your early peeling frustrations on your next sensor change.
What’s the best way to find the right Dexcom patch quickly?
The easiest path is to jump straight to our full range of Dexcom patches and use our quick device filter. We have clearly separated the G6 and G7 options so you can pick your size without second-guessing. If you’re still feeling unsure, don’t sweat it—just snap a quick photo of the sensor on your arm and email it over to us, and we’ll tell you exactly what you need.
Disclaimer: This content is for informational purposes only and is not intended as medical advice. Always consult your diabetes care team or a qualified healthcare professional before making any changes to your diabetes management.
