Anxiety about dental treatment prevents the patients from receiving adequate dental care. Children feel more anxious about the dental treatment than adults. The change in behaviour of children affects the treatment quality due to compromised cooperation towards dental treatment. Anxiety can be reduced by both pharmacological and non-pharmacological behaviour management techniques. Relaxation techniques are considered to be patient-compliant and cost effective non-pharmacological method for reducing anxiety of the patients. Progressive muscle relaxation [PMR] is a relaxation technique that involves contraction and relaxation of different muscle group in order to reduce stress of the patients. Behaviour, heart rate and oxygen saturation levels are affected with increased anxiety. The present study evaluated the effectiveness of PMR in reduction of anxiety among 6–10-year-old children undergoing pulp therapy under local anesthesia. The anxiety levels and behaviour of the patients were determined based on the modified dental anxiety scale and frankel’s behaviour rating respectively. Pulse oximeter was used to determine the heart rate and oxygen saturation levels. The results showed significant decrease in anxiety and heart rate in patients under PMR group. Also, children under PMR group exhibited positive attitude towards treatment than the control group. PMR can be effectively used as a behaviour management technique for anxious children in dental environment.