Task: Evaluate the tweet for emotional cues and classify it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that indicate the tweeter's state of mind.
Tweet: Root canal therapy has had a bad reputation in the past... but new technology has allowed more comfortable procedures! #smile #dental
This tweet contains emotions: 
anticipation, joy, optimism, trust