Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
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