asahameed:
I notice you're from TO, so did you take the Canadian DAT or the US DAT?
If you took the Canadian DAT, then you can explain your soap carving score on why you did well and back it up with anything you perform well like Dr2b mentioned.
If you did not do well on the manual dexterity component of the exam, then tell them it was not indicative of your ability and tell them about your abilities. I didn't do to well on the soap carving and had to back it up by saying I was involved in carpentry and play sports like volleyball needing excellent hand-eye coordination and skill.
The interviews at Tufts and Bu are both really laid back. Just do some background checks on their websites or catalogues and see what they advertise as their strengths you'll get a good idea about each school before your tour and interview. Just relax and be able to answer any queations about weaknesses on your DAT scores, transcripts, or anything else. Be able to answer the basic questions like why you want to be a dentist?...your strengths and weaknesses?...leadership skills?...problem solving ability?...time management?...etc.
BU may tell you right away if you're accepted or not and will send you a letter in a week or so.
Tufts will notify you'll get a letter within 10days...don't worry, the adm. committee people said that about 80% of the students interviewed at Tufts will be accepted.
Good luck!