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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Does Mounjaro Affect Your Teeth?
There is growing interest in whether Mounjaro (tirzepatide) affects dental health. While tooth decay and gum disease are not listed as direct side effects of Mounjaro in the clinical trials or product information, there are several indirect ways that weight loss injections may impact your teeth and gums. This guide explains what the evidence shows, what to watch for, and when to speak to your dentist or GP.
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Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
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.
How Weight Loss Injections May Affect Dental Health
Mounjaro is a dual GIP and GLP-1 receptor agonist prescribed for weight management in UK adults with a BMI of 30 or above, or 27 and above with weight-related health conditions. While tirzepatide doesn't directly damage teeth, several indirect mechanisms may affect oral health:
- Dry mouth (xerostomia): Reduced saliva production is a common side effect of Mounjaro. Saliva protects teeth by neutralising acids and preventing bacterial growth — low saliva increases decay risk.
- Nausea and vomiting: Stomach acid from vomiting can erode tooth enamel over time, weakening tooth structure.
- Dietary changes: Rapid appetite suppression may lead to nutritional deficiencies (calcium, vitamin D, B vitamins) essential for strong teeth and gum health.
- Reduced food intake: Lower overall food consumption might mean insufficient nutrients to maintain healthy gums and tooth structure.
These are indirect risks, not direct medication effects — they relate to how the injection changes your body's processes.
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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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What You Should Do to Protect Your Teeth on Mounjaro
If you're taking Mounjaro, protect your dental health by staying hydrated — aim for 2–3 litres of water daily to combat dry mouth. Chew sugar-free gum between meals to stimulate saliva production, and rinse your mouth with water after any vomiting. Maintain excellent oral hygiene: brush twice daily with fluoride toothpaste and floss daily. Inform your dentist that you're taking Mounjaro so they can monitor for early signs of decay or gum disease. Ensure your diet includes adequate calcium (dairy, fortified plant milks, leafy greens) and vitamin D — essential for tooth and bone strength. Schedule regular dental check-ups every 6 months rather than annually, especially if you experience persistent dry mouth. If you notice any tooth sensitivity, pain, or gum changes, contact your dentist promptly. Your GP can also assess whether any dental symptoms are related to Mounjaro.
- 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 decay listed as a side effect of Mounjaro?
No, tooth decay is not listed as a direct side effect in Mounjaro's clinical trials or product information. However, indirect effects like dry mouth and nausea may increase decay risk over time. If you're concerned about dental changes, discuss them with your dentist or GP.
Can Mounjaro cause dry mouth?
Yes, dry mouth is a reported side effect of Mounjaro. Saliva is crucial for protecting teeth, so reduced saliva increases the risk of tooth decay and gum disease. Staying hydrated, chewing sugar-free gum, and using sugar-free lozenges can help manage this side effect.
Does vomiting from Mounjaro damage teeth?
Stomach acid from vomiting can erode tooth enamel if it happens repeatedly. Rinse your mouth with water after vomiting and wait 30 minutes before brushing (brushing immediately after acid exposure can cause further damage). If vomiting is severe, speak to your GP about managing this side effect.
What nutritional deficiencies might affect teeth on Mounjaro?
Calcium and vitamin D are essential for tooth strength and gum health. Rapid appetite suppression may reduce intake of dairy, leafy greens, and fortified foods. Ensure your diet includes these nutrients, and consider discussing supplementation with your GP or a dietitian if you're losing weight quickly.
Should I tell my dentist I'm taking Mounjaro?
Yes, absolutely. Inform your dentist and dental hygienist that you're taking Mounjaro, especially if you experience dry mouth, tooth sensitivity, or gum changes. They can monitor more closely and adjust cleaning schedules or preventive care as needed.
Ready to take control of your weight loss journey?
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