Task: Analyze the tweet's emotional connotations 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 best portray 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! #smile #dental
This tweet contains emotions: 
anticipation, joy, optimism, trust