Task: Categorize the tweet's emotional tone as either 'neutral or no emotion' or identify the presence of one or more of the given 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! #smile #dental
This tweet contains emotions: 
anticipation, joy, optimism, trust