A toothache can generally be diagnosed from the symptoms. Tooth tender to touch, pain kept you awake last night, hot drinks make the pain worse but cold drinks make it better: This is an abscess. You need this tooth treated as soon as possible.
Toothache for no reason, possibly in waves. Pain is severe but then passes. This is probably an abscess starting.
Tooth hurts when chewing hard things. Pain comes quickly and goes quickly. There is no pain at other times. This is most likely a cracked tooth or filling.
Tooth hurts when eating or drinking sweet things - this is most likely a hole.
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