No, but you need to be both intellectually capable of learning/understanding science and determined enough to absorb and retain it.
Like others say, once your in clinic and have taken part #1, you can forget 80% of the core sciences you learned and still do well and become a great dentist.
If you, "hate" science I would seriously think out your decision to become a dentist for it will be a real rough two years, to say the very least!