The effects of dental anaesthetic can vary from person to person but local anaesthetic works quickly, regardless of any medical conditions.

The effects of dental local anaesthetic can last for several hours. In general, dental local anaesthesia will wear off after about 4 to 6 hours.

How long does dental anaesthetic take to work?

You will begin to feel numbness, tingling and a stinging sensation in the injection site, then a loss of sensation. Your mouth, lips, gums and bottom jaw may feel heavy or swollen and not be working properly. You should avoid eating or drinking or any physical activity until the numbing effect has worn off completely. This is because you may still be at risk of hurting yourself or even biting something and not feeling it, which is common for many patients.

What is local anaesthetic?

A local anaesthetic is a medication that numbs a specific area of the body. Local anaesthetics are usually injected into the tissue around the treatment area to work as a nerve block yet maintain blood flow. Many dental procedures require local anaesthetics, and the majority will also make your tongue numb. Some local anaesthetics can be used as general anaesthetics (such as propofol), which cause loss of consciousness and total body numbness. However, these are not commonly used for routine procedures.

How does local anaesthetic work?

Local anaesthetics work by blocking nerve signals. They do this by binding to the protein channels in the cell membrane that are responsible for sending pain signals to the brain. When local anaesthetic binds to these channels, it prevents them from opening. This prevents pain signals from being sent to the brain, and the area of the body that is affected by the anaesthetic will become numb.

Are there any side effects to local anaesthetic?

Any temporary numbness or tingling usually goes away when the anaesthetic wears off. Other possible side effects include allergic reactions (such as hives, itching, or swelling), low blood pressure, dizziness, nausea or vomiting and slow heart rate. The area in the mouth around where you had work done, such as a dental crown, may be a little tender when the anaesthetic wears off.

What are the risks of local anaesthetic?

Local anaesthetics are generally safe and have a low risk of serious complications. Some of the more serious risks associated with local anaesthetic include allergic reactions, low blood pressure, and slow heart rate.

What is local anaesthetic made of?

The most common local anaesthetics are lidocaine, bupivacaine, and mepivacaine. These local anaesthetics work by blocking the action of sodium channels, which are responsible for transmitting electrical signals between nerve cells.

When injected, local anaesthetics can cause temporary numbness and paralysis of the muscles in the area. For more information on local anaesthetic, take a look at Health Direct.

Are there different types of dental anaesthetics?

Yes, there are different types of dental anaesthetics. The most common dental anaesthetics are listed below.

Local anaesthesia

This numbs a specific area of the mouth and is ideal for work like dental fillings. It is usually injected into the gum around the tooth that is to be treated and will make the area numb for a few hours.

Nitrous oxide (laughing gas)

This is a mild form of sedation that can help you to relax during dental treatment. It works to reduce anxiety and make you feel less aware of what is happening around you.

General anaesthesia

This puts you to sleep during dental treatment. It is usually only used for more complex procedures. General anaesthesia is administered through an IV drip or a gas that you inhale through a mask.

Intravenous (IV) sedation

This involves injecting a small amount of medication into a vein in your arm.