Making A Travel Insurance Claim

Can anybody help,i have annual travel insurance and i made a claim in may 08 for dental work i did have a little more work done than was stated on the receipt without takeing the pee,and it was only my 2nd claim in 22 years of travel,but i,am arriving in los next week and have been having some tooth ache and i need another filling and was thinking of also getting my teeth cleaned as the excess would be about the price of the filling,but will they pay out for more treatment or would i be better off getting a single trip policy for about £10.00 and claiming off that,but have also heard they share information so that could make it not worthwhile.anyone know