Possible Clues:

• Local disappointment for amateur on strike where one might find enamel (1,4,2,3,5)
• Slight thrill giving work for the dentist? (1,4,2,3,5)
• What a gum shield is supposed to protect against is a big disappointment (1,4,2,3,5)
• The kitchen Katie designed is a terrible disappointment (1,4,2,3,5)