Scientists have found a new method to deliver anaesthesia using a tiny electric current instead of a needle. This process called iontophoresis, is a good news for people who fear painful injections by the dentist. Researchers say the advance could help improve dental procedures, save money and avoid contamination.<br/> <br/>The technology can improve drug delivery to various organs and has applications in other areas such as cancer treatment.<br/>The study was published in the journal Colloids and Surfaces B: Biointerfaces.