What to do....

I have been thinking for a while now of how to get around this or a way to do it properly. I am going to be selling Pureromance and my husband gave me $300 to buy my starter kit because he knows how much I want to do this. But I go in to get a cavity fixed tomorrow that I asked my grandpa to help me pay for because my part time job just doesn't pay for shit. I get $200 or a little more every 2 weeks. The cavity may cost anywhere from $110-$180 to fix depending on the amount of work it takes to fix it. I feel so bad for having to ask for help with stuff. My grandpa likes to help though. And my husband gave me that money to start in this business because I really want to. And before you say anything I have been applying for other jobs for a year and have had no luck getting a different one. Any ideas? Please don't be rude.