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Lidocaine never really crosses your mind until the dentist appointment hits. One minute you are in the chair and the next you are poking at a cheek that feels like it belongs to somebody else.
It is strange, a little frustrating, and impossible to ignore, which is exactly when the question hits: how long does lidocaine last? There is no single answer as the duration varies from person to person. But the good news is that it always wears off within a few hours.
In this blog, you will find everything about how lidocaine works in your body, how long do lidocaine patches last, tips to manage the numbness, factors that can change how long lidocaine lasts, when to call your doctor and a lot more.
What is Lidocaine and How Does it Work?
Lidocaine is a local anesthetic that dentists and doctors use to numb a specific area before a procedure. It blocks nerve signals so your brain stops getting pain messages from that area.
You can only get it with a doctor's prescription. Outside of dental work, lidocaine also helps with sunburn, minor cuts, insect stings and urethritis. It works as a topical solution for sore throat and mouth pain too.
People who have had shingles sometimes keep feeling nerve pain long after the rash clears up. This is called postherpetic neuralgia and lidocaine patches are regularly used to manage it.
Some dentists also use lidocaine to keep the gag reflex under control during impressions or X-rays, which makes things a lot more comfortable for the patient.
When Will the Lidocaine Numbness Go Away?
After a procedure most people want to know one thing: how long does lidocaine last. For the majority of patients the numbness hangs around for 1 to 3 hours. But that number shifts depending on where the injection went in, how much was used and what kind of procedure you had done. Spots with a lot of blood vessels clear the medication out faster. Bigger doses stick around longer.
Your metabolism is part of it too. A faster metabolism burns through it quicker. A slower one means you might stay numb longer than the person sitting next to you in the waiting room. Doctors usually factor this in when they work out the right dose for you.
A study in the British Journal of Anaesthesia found something interesting too. Even after the numbness fades, lidocaine keeps working in the background by helping reduce pain during recovery.
Factors That Can Change How Long Lidocaine Lasts
No two people feel lidocaine the same way. Here is what actually changes things:
| Factors | What You Should Know |
|---|---|
| Dosage | Higher doses take longer to wear off |
| Area of Application | Areas with more blood vessels absorb lidocaine faster, which shortens the numbing time |
| Individual Metabolism | People with a faster metabolism process lidocaine quicker, meaning the numbness fades sooner |
| Combination with Other Medications | When lidocaine is combined with epinephrine, it constricts blood vessels and makes the numbing effect last longer |
Average Duration of Lidocaine Numbness for Different Procedures
Every procedure is different and so is every person. Here is a rough idea of how long things tend to last:
| Procedure | How Long Numbness Lasts |
|---|---|
| Routine Fillings | 1 to 3 hours |
| Simple Tooth Extractions | 3 to 5 hours |
| Root Canals | 3 to 5 hours or longer |
| Complex Surgeries | 6 to 8 hours or more |
These are just rough estimates. How old you are, your metabolism, and how much lidocaine was used can all affect how quickly it leaves your body.
How Long do Lidocaine Patches Last?
Patches are a good choice when you need relief that lasts longer than a standard injection. After you put the patch on, it usually takes around an hour to start working. Once it kicks in, you can get relief for up to 12 hours.
Does Epinephrine Make Lidocaine Last Longer?
Yes, it does. Sometimes doctors mix lidocaine with epinephrine when they need the numbness to hold on longer. Epinephrine tightens the blood vessels, which slows down how fast lidocaine gets pulled into the bloodstream. The numbness ends up lasting longer as a result.
5 Ways to Manage Lidocaine Numbness After Dental Procedures
It will go away on its own. Until then here are a few things worth keeping in mind:
Avoid Chewing
Hold off on eating until the feeling fully comes back. Biting your tongue or cheek without realizing it happens more than people expect.
Be Careful with Hot Drinks
Heat is hard to feel when you are numb. Wait until sensation returns before drinking anything hot or you risk burning your mouth without knowing it.
Keep Up with Oral Hygiene
Keep brushing and flossing but take it slow. The numbness makes it tricky to do it properly so be gentle with yourself.
Avoid Numbing Remedies
Leave the over-the-counter numbing gels alone unless your doctor has told you specifically to use them.
Follow Your Doctor's Instructions
If something feels off or the numbness is going on longer than it should, just call your doctor and ask.
How to Make Lidocaine Wear Off Faster
Want the feeling back sooner? These actually help:
Gently Massage Your Face
Use your fingertips to rub your cheeks, lips or jaw in small, slow circles. Getting blood moving to the area brings sensation back faster. Go easy near any fresh dental work, though.
Use a Warm Compress
Hold a warm towel against the numb spot for around 15 to 20 minutes. It gets blood flowing and helps the anesthetic break down quicker. Check the temperature before you press it to your face and skip this if there is any swelling.
Move Around a Little
A short walk or gently moving your jaw gets circulation going and helps things fade faster. Nothing too intense though.
Sip Warm Liquids
Warm tea, water or broth can activate the nerves back awake and get blood moving again. Always check the temperature first since your mouth probably cannot sense heat properly yet.
Wait it Out
Sometimes there is nothing to do but sit with it. Most people have a full feeling back within 2 to 4 hours without doing anything at all.
When Should You Call a Doctor?
A bit of numbness after a procedure is nothing to worry about. But if you are still wondering how long does lidocaine last and 6 hours have passed with no change at all, it is time to call your doctor.
In rare cases the needle can nick or irritate a nerve during the injection. When that happens, the numbness can drag on well past the normal window. It doesn’t happen often but your doctor needs to know about it if it does.
3 Tips for Using Lidocaine Safely
Lidocaine has a long safety record. Still a few things are worth keeping in mind:
| Tips | Why it Matters |
|---|---|
| Follow Directions | Always use lidocaine exactly as your doctor tells you, whether it is a patch, cream or injection |
| Avoid Overuse | Using too much lidocaine can increase the risk of side effects so stick to the recommended amount |
| Inform Your Doctor | Always tell your doctor about any allergies or other medications you are taking before using lidocaine |
Are There Any Side Effects of Lidocaine?
Like most medications, lidocaine can cause some side effects. Here is what to watch for:
| Type | What You Might Feel |
|---|---|
| Mild | Redness, swelling, or slight irritation where you applied it |
| Moderate | Dizziness, nausea, or a mild headache |
| Severe | Allergic reaction, trouble breathing, or major swelling |
Conclusion
Lidocaine does its job quietly without causing any trouble. You barely notice it working until the numbness starts to lift and you realize the whole procedure is already completed.
Whether it was a routine filling or longer-term nerve pain managed with a patch, knowing how long does lidocaine last and what is normal takes a lot of the worry out of it.
The numbness always wears off within a few hours usually within 1 to 3 hours. If anything feels off or you are unsure about something, just call your doctor. That is always the right move. Finding the right doctor shouldn’t be another thing to stress about.
This is where CureMeAbroad helps clients connect with experienced doctors and trusted clinics, making it easier for you to access the right care whenever needed.
FAQs
1. What's the 3, 5, 7 rule for lidocaine?
It refers to the maximum safe doses based on body weight. That is 3mg/kg for bupivacaine or ropivacaine, 5mg/kg for plain lidocaine and 7mg/kg for lidocaine with epinephrine. Doctors use this to figure out safe amounts so do not try to calculate this on your own.
2. Will lidocaine make you sleepy?
It can cause mild drowsiness but this is not something most people notice after a regular dental injection or patch. Feeling unusually tired or lightheaded has been reported, though, mostly when more of the medication gets into the bloodstream than expected. If it is strong or does not go away, call your doctor.
3. What neutralizes lidocaine?
Lidocaine can feel slightly acidic going in. Doctors often mix it with a small amount of baking soda to take the sting out and balance the acidity.
4. What are the early signs of lidocaine toxicity?
The nervous system usually shows signs first. Watch out for:
- Feeling dizzy, lightheaded or confused
- Tingling or numbness around the mouth or lips
- Ringing in the ears
- Blurred vision
- Shivering or twitching muscles
If any of these show up, get medical help straight away. It can turn serious fast.
References
https://www.marconidentalgroup.com/how-long-does-lidocaine-last/
https://westhoustonperiodontics.com/understanding-the-duration-of-lidocaine-insights-from-west-houston-periodontics/
https://www.westparkvillagedental.com/blog/how-long-does-dental-numbing-last/
https://www.yashodahospitals.com/medicine-faqs/lidocaine/
https://www.sanmarindental.com/blog/unnumb-your-mouth-after-dentist/
https://www.bjanaesthesia.org/article/S0007-0912(17)30243-X/fulltext
