The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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Mounjaro and Teeth — What the Evidence Shows
Some people taking Mounjaro (tirzepatide) have reported tooth and gum problems, though this is not listed as a common side effect in the official information. If you're considering this prescription weight loss injection or already taking it, understanding how it might affect your dental health is important. This guide explains what we know, what the evidence suggests, and how to protect your teeth while using GLP-1 or dual receptor agonist medications in the UK.
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What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
Mounjaro, Teeth, and Reported Side Effects
Tooth problems reported with Mounjaro and similar GLP-1 medications include cavities, gum recession, tooth loss, and mouth sores. These are not officially listed as common side effects by the MHRA, but dental issues have been discussed online by users and referenced in some clinical reports. The exact mechanism is not fully understood.
Why might Mounjaro affect teeth? Several factors may contribute: reduced saliva production (dry mouth is a reported side effect), changes in eating habits and food choices, weight loss medications can cause dehydration, vomiting or acid reflux may expose teeth to stomach acid, and reduced appetite might lead to skipping meals or inconsistent nutrition. Nausea and vomiting are very common side effects on Mounjaro — these can weaken tooth enamel over time.
If you experience persistent mouth sores, bleeding gums, tooth pain, or other dental problems while taking Mounjaro, inform your prescriber and your dentist immediately.
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Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
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Protecting Your Teeth While on Mounjaro in the UK
If you're taking Mounjaro or considering this medication, preventive dental care is essential: maintain regular dental check-ups with your NHS dentist or private dentist, brush twice daily with fluoride toothpaste, floss daily to prevent gum disease, stay hydrated by drinking plenty of water (this counters dry mouth), avoid sugary foods and drinks — especially important if you experience nausea or vomiting, rinse your mouth with water after vomiting to neutralise stomach acid, and avoid acidic drinks like fizzy beverages.
Your GP or prescriber should be aware of any pre-existing dental problems before starting Mounjaro. If you develop new dental issues after starting treatment, report this to both your prescriber and your dentist. They may adjust your treatment plan or recommend additional preventive measures based on your individual health situation.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Is tooth loss a common side effect of Mounjaro in the UK?
Tooth loss is not listed as a common side effect of Mounjaro by the MHRA, but some users have reported dental problems. While rare, it's important to monitor your oral health and report any issues to your dentist and prescriber. Maintaining good dental hygiene and regular check-ups during treatment is recommended.
Does Mounjaro cause dry mouth, and does that affect teeth?
Yes, dry mouth (reduced saliva) is a reported side effect. Saliva protects teeth from decay, so reduced saliva may increase cavity risk. Drink plenty of water, use sugar-free lozenges if needed, and inform your dentist that you're taking Mounjaro so they can recommend additional preventive care.
Can vomiting from Mounjaro damage my teeth?
Vomiting can expose teeth to stomach acid, which weakens enamel over time. If you experience nausea or vomiting on Mounjaro, rinse your mouth with water afterwards and wait 30 minutes before brushing (to avoid damaging softened enamel). Talk to your prescriber if vomiting is severe or persistent.
Should I tell my dentist I'm taking Mounjaro?
Yes — inform your NHS or private dentist that you're taking Mounjaro before any treatment. This allows them to assess your individual risk for dental problems and recommend preventive measures. They may suggest more frequent check-ups or additional protective treatments if needed.
What should I do if I develop tooth problems while on Mounjaro?
Report any dental issues — such as pain, sensitivity, swelling, or loose teeth — to your dentist immediately and inform your prescriber. Do not stop taking Mounjaro without guidance. Your healthcare team can assess whether the dental problem is related to the medication and adjust your care accordingly.
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