Getting your take-home whitening trays fitted at our West Byfleet practice is a straightforward process, but there are several stages involved that patients don’t always know about in advance.
This page walks you through what actually happens at each appointment, what to expect when you use the trays at home, and how to get the most from your treatment. If you’ve been considering whitening for a while and want to understand the practical detail before committing, this is a useful place to start.
Why the Fitting Process Matters
The effectiveness of take-home whitening depends almost entirely on how well the trays fit your teeth. A poorly fitting tray allows the whitening gel to leak onto your gums, which can cause irritation and reduce the amount of gel in contact with your enamel. Custom-made trays, fitted by a dentist, are designed to sit snugly against each tooth, keeping the gel exactly where it needs to be.
That’s why we don’t simply hand over a kit at the first appointment. There are two separate visits involved, and both serve a specific purpose.
Your First Appointment: Impressions
At your initial consultation, we assess whether whitening is suitable for you. This means checking the condition of your teeth and gums, noting any existing restorations such as crowns or veneers (which will not respond to whitening gel), and discussing your expectations for the outcome.
If whitening is appropriate, we take impressions of both your upper and lower teeth. These are physical moulds that capture the precise shape of your dentition. The impressions are then sent to a dental laboratory, where your custom trays are fabricated from thin, flexible plastic. This process typically takes around one week.
In our experience, patients who take a moment during this first appointment to ask questions about the gel strength and expected timescales get more from the process overall. We’re happy to discuss all of this at the time.
Worth knowing: whitening is a cosmetic treatment and is not available on the NHS. The cost covers both appointments and the full course of gel.
Your Second Appointment: Tray Fitting and Instruction
When your trays are ready, you return to the practice to have them checked and fitted. We place each tray in your mouth and confirm that it seats properly against your teeth without gaps or pressure points. Minor adjustments can be made chairside if needed.
At this appointment, we also walk you through how to use the kit at home:
- How to apply the correct amount of gel to the tray (usually a small dot per tooth)
- How long to wear the trays each session (typically two to four hours, depending on the gel concentration)
- Whether to whiten during the day or overnight (this varies by individual and gel type)
- How to clean the trays after each use
- What to avoid eating or drinking during the treatment period
- How to manage any sensitivity that arises
You leave this appointment with your trays, your gel syringes, and a clear picture of what to do at home. Most patients find the process simpler than they expected once they’ve had it demonstrated.
UK Regulations: Who Can Legally Provide Whitening Gel
It’s worth being clear on the legal context. Under UK law, only GDC-registered dentists (and certain other registered dental professionals working under a dentist’s prescription) can legally supply whitening gel containing between 0.1% and 6% hydrogen peroxide. Products above 6% hydrogen peroxide are prohibited entirely.
This means that whitening kits sold in beauty salons, online, or from unregulated sources cannot legally contain effective concentrations of hydrogen peroxide. The General Dental Council is clear that providing whitening treatment outside registered dental practice constitutes illegal practice, regardless of what the seller claims.
Professional take-home trays from a dentist use up to 6% hydrogen peroxide gel. That’s the maximum permitted concentration for home use, and it’s significantly stronger than anything available over the counter.
Using Your Trays at Home: What the Process Looks Like
Most patients complete their initial whitening course over two to three weeks, wearing the trays for the recommended period each day. The exact duration depends on your starting shade and how significant a change you’re looking for.
A typical home whitening routine looks like this:
- Brush your teeth before inserting the trays
- Apply a small amount of gel to the front surface of each tray tooth pocket
- Insert the tray and press gently to seat it
- Remove the tray after the prescribed wear time
- Rinse your mouth and rinse the tray with cool water
- Avoid food and drink (other than water) for 30 minutes after removing the tray
Not every patient follows exactly the same schedule. Some gel formulations are designed for overnight use, while others work best in shorter daytime sessions. We’ll recommend the approach that suits your situation.
Managing Sensitivity During Treatment
Tooth sensitivity during whitening is common, particularly in the first few days of treatment. Most patients experience mild-to-moderate sensitivity that settles within 24 hours of each session. It’s rarely severe enough to stop treatment entirely.
The NHS guidance on teeth whitening notes that temporary sensitivity and gum soreness are the most common side effects. Where sensitivity is pronounced, we typically advise:
- Reducing wear time per session (for example, from four hours to two)
- Skipping a day between sessions
- Using a sensitivity toothpaste in the tray for 30 minutes before applying the gel
- Avoiding very hot or cold food and drink during the treatment period
Sensitivity almost always resolves once the treatment course is complete. It doesn’t indicate that anything has gone wrong.
Comparing the Key Stages at a Glance
| Stage | What Happens | Typical Timing |
|---|---|---|
| Consultation and impressions | Suitability assessment, dental check, moulds taken | Appointment 1 (approx. 30–40 minutes) |
| Laboratory fabrication | Custom trays made from impressions | Approx. 5–7 working days |
| Tray fitting and instruction | Fit check, adjustments, home-use guidance | Appointment 2 (approx. 20–30 minutes) |
| Home whitening course | Daily tray use with prescribed gel | 2–3 weeks |
| Top-up whitening (optional) | Periodic use of trays with fresh gel | As needed, typically annually |
After Your Course: Maintaining Results
One of the practical advantages of take-home trays over in-surgery whitening is that you keep the trays at the end of treatment. This means that top-up whitening, whenever the shade starts to fade, is simply a matter of buying additional gel syringes and using the trays you already have.
Results from professional whitening typically last around two to three years with normal dietary habits. Patients who smoke heavily, drink a lot of coffee or red wine, or have naturally porous enamel may find their results fade more quickly.
In practice, most patients find a single annual top-up session, lasting just a few nights, is enough to maintain their preferred shade without needing to repeat the full initial course.
If you’d like to find out whether take-home whitening trays are right for you, or to book a consultation at Coniston Dental Practice, please call us on 01932 343675. We’re happy to answer any questions before you commit to an appointment.
