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If your dentist accepts credit cards, you should consider applying for a card with a 0% interest introductory period. For example, you can apply for the Discover it® Cash Back credit card offers 15 months of no interest intro APR (after the introductory period is over, then 17.74% - 27.74% Variable APR on purchases will apply). Plus the card offers 1% cash back on all your purchases, including dental work. Earn 5% cash back on everyday purchases at different places you shop each quarter like grocery stores, restaurants, gas stations, and more, up to the quarterly maximum when you activate. There is $0 annual fee.
However, if you need cash because your dentist doesn't accept credit card payments, you can consider applying for a personal loan. When applying for a loan, you can request a specific amount. Once you qualify, funds can be posited to your account as fast as in two business days.