M3 Promo for 417: "I Was At the Dentist, and I Think I Got Treated By "A""

Here's the M3 Canadian promo for next week's episode 417 Bite Your Tongue!

Some clues from the promo

• Not too much revealing stuff in the promo...but looks like both Hanna and Emily will both be put in danger in 417....and who will Em end up attacking in her room?
• Spencer will continue to try to put together the stories from Ali's diary - maybe Spencer finds one about her? (cue flashback)
• Snippet of Mike and Mona (which we know that Aria is not too happy with), so much so that she seems to go to Jesse, the school councellor, and tell him that Mona is the devil...

What are you most excited about?