How long has the cat known you? It was exactly the same with my cats, but they gradually let me touch their bellies and paws more and more. A declawed cat feels defenseless, so if they don't yet fully trust you, they'll be all the more scared of letting you get near those places, and will use their teeth more. I would say time is key.
The Royal von Meouw Dynasty: His Royal Highness the late Prince von Meouw,
Her Royal Highness Princess Gatita von Meouw, Nikita Duchess of Meouw and
His Highness Cuchi-Cuchi, next in line for the throne of Prince von Meouw.