Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: Root canal therapy has had a bad reputation in the past... but new technology has allowed more comfortable procedures!  #dental
This tweet contains emotions: 
anticipation, joy, optimism, surprise