Painless Injections for Children: How the STA System Works

For many children — and many adults — the injection is the most dreaded part of a dental visit. The good news is that the stinging, burning sensation most people associate with dental anaesthesia is not inevitable. At Tiny Teeth, we use the STA (Single Tooth Anaesthesia) system, a computer-controlled device that delivers local anaesthetic so slowly and evenly that most children barely feel it.

What causes the sting in a traditional injection?

The discomfort from a dental injection is almost entirely caused by pressure, not the needle itself. When a solution is pushed in too quickly, it forces its way into the tissue and triggers pain receptors. A traditional syringe relies on the dentist's hand to control the pressure — and even with the best technique, the flow is rarely perfectly steady.

How STA is different

The STA system — also called The Wand in some countries — is a small handpiece connected to a computer that controls the flow of anaesthetic automatically. The computer keeps the pressure below the threshold that triggers pain, no matter what. The result is a slow, steady trickle that tissue simply does not register as painful.

Because the handpiece looks nothing like a traditional syringe, it is also much less visually threatening for children who have built up a fear of "the needle."

What your child will feel

Most children describe it as pressure or a mild buzzing sensation. Some feel nothing at all. The injection takes slightly longer than a traditional one — usually around 60 to 90 seconds — but that time is spent comfortably rather than bracing against pain.

Numbing just one tooth

STA was originally developed to allow single-tooth anaesthesia — numbing only the tooth being treated, rather than half the jaw. This means:

• No droopy lip or cheek after the appointment
• Your child can eat, drink and talk normally much sooner
• Less confusion and anxiety for younger children who find the numb feeling upsetting

In practice, we choose the anaesthetic approach that fits each child and each procedure. For some treatments, a wider area of numbness is still the right choice. Dr. Mohsen will always explain what to expect before starting.

Is it suitable for all children?

The STA system works well for most children from around the age of three upwards. For very young children, for complex procedures, or for children with high dental anxiety, we may discuss sedation as an additional option. Every child is assessed individually — the goal is always the most comfortable experience possible.

Before the injection

To make the experience even more comfortable, we apply a topical anaesthetic gel to the gum before any injection. This numbs the surface so your child feels even less when the STA handpiece is placed.

We also take time to show children the equipment, explain what will happen in simple language, and move at a pace that keeps them calm. The injection itself is never rushed.