Computer-controlled local anaesthetic: how it works and what it costs

If you are worried about dental injections, tell the dentist before treatment begins. Computer-controlled delivery is one option that may make the injection more comfortable. It still uses local anaesthetic and a needle; it does not put you to sleep.

The dentist chooses the medicine, dose and injection technique after checking your health, medicines, allergies and the treatment you need. A delivery device does not replace those decisions.

How does local anaesthetic work?

Local anaesthetic temporarily blocks pain signals from the area being treated. You remain awake. The dentist checks that the area is numb before starting; tell them if you feel pain so they can pause and reassess.

An injection can briefly sting or feel uncomfortable. Numbness may last for several hours, depending on the medicine and where it is given. Follow the dentist’s instructions while it wears off, including taking care not to bite a numb lip, cheek or tongue.

What does the computer control?

With a computer-controlled system, an electronic device regulates delivery through a small handpiece. Controlled flow aims to reduce discomfort associated with injecting the solution. Some handpieces look more like a pen than a conventional syringe, which some patients find less daunting.

This does not guarantee a painless injection or mean that no further anaesthetic will be needed. The effect also depends on the injection site, technique and the condition of the tooth. Your dentist can explain why a particular approach is suitable for you.

Benefits and limits

The approach may help some anxious adults and children. It can be considered for different dental treatments where local anaesthetic is needed, but it is not necessary or suitable for every procedure or patient.

It is still possible to have numbness in the surrounding soft tissues. An electronic injection cannot guarantee no swelling after a dental procedure either. Local anaesthetics are generally safe, but side effects and, rarely, serious reactions can occur. Tell the team about previous reactions rather than assuming this delivery method removes the risk.

The NHS guide to local anaesthetic explains what it does and possible side effects. Contact the practice if numbness lasts longer than advised or you are concerned about symptoms afterwards.

What does it cost?

Our fee schedule lists computerised local anaesthetic (Sleeper One) at £20. This is the anaesthetic item, not the price of the filling, extraction or other treatment. Ask whether it is proposed for your appointment and how it fits into your estimate. See the dentistry fee schedule.

If fear is making it difficult to attend, contact the practice to discuss what worries you. Agreeing a stop signal, having the steps explained and planning breaks can help you feel more in control. Our guide to dental anxiety discusses ways to prepare for a visit.