Possible Clues:

• Trouble ahead — also hot during growth ahead
• The reason for an oral examination?
• By the sound of it, may be in size or pain
• Cause of sore mouth, excessively hot in facial hair
• Pain that's hard also arising in facial growth
• 'There was never yet philosopher, / That could endure the -- patiently' (Much Ado)
• Trouble with choppers
• Illness of nippers not suitable for paediatrician?
• It causes grief to destroy ducks with hatchet
• Snort horse - a revolutionary and painful experience