I say its coincidence ..... any fever?

Joel

    Normal to have some sensitivity to cold and soreness after a scaling,
esp. if there had been a lot of subgingival calculus.
    Occasionally have seen infection, esp. with patients with pre-existing
periodontal disease--presumably from some errant piece of dislodged
calculus impacting into a gingival pocket.
    If you see gingival swelling and/or bad taste indicating purulent
discharge, check with your dentist.  Otherwise, some salt water rinsing
(1/2 tsp./8 oz.) should do the trick.

Steve