Teething or Old Habit?

For awhile my daughter was waking up at 3:00 a.m. and sometimes it was due to teething. When the pattern persisted, I thought she was making it a habit. She has been sleeping until at least 5:30, 5:45 until last night. Alyssa woke up at 3 again and I gave her some all-natural teething tablets. After that she woke up at 6:00 which is fine. I am concerned that she may start this "getting-up-in-the-middle-of-the-night" routine again. How do I really know if it is teething, a bad dream or perhaps my husband waking to go to work at night? It has taken a very long time to get Alyssa to sleep through the night and I realized part of that was my fault. I used to give her a bottle at 4 or 4:30 past six months old. She will be ten months this week and I don't want her to start the middle-of-the night routine again. Thank you.

P.S. Do I just let her cry for awhile if she does get up again tonight?