I've had my full set of dentures for about 6 weeks now uppers are no problem, lowers I've just began to wear them about 2 weeks ago. Using Fixodent Plus my lowers only last around 8-9 hours before then come loose, which makes it around dinner time. Is that the normal time for them to stay on? 2): On the illustration on how to apply it shows putting on 3 lines of Fixodent on the lowers and still have room between the lines, with my lowers I barely have enough room for 2, I have to put 1 line on the side of the denture to get 3 lines on. Is that normal or are gums that small?