Going to the dentist ranks among Americans's greatest fears, and many swear by nitrous oxide -- you know, laughing gas -- to get through the procedures. Now imagine if the tables turned.

That's right. Dentist Sharon O'Steen of DeBary, Florida, has been accused of inhaling laughing gas in front of patients before performing procedures on them. In a no-brainer move, Florida health officials have suspended O'Steen's license.

Dental malpractice is considered highly difficult to prove, though patients have been awarded millions of dollars in dental malpractice suits in the past.

Take Aspen Dental, a large corporate-dental chain in Denver that was sued a few weeks ago for allegedly overcharging patients, performing unnecessary treatments and forcing patients who could not afford dental treatments into debt.

Another story of dental malpractice shocked Floridians in 2010, when Tampa dentist Ralph Eichstaedt allegedly left a drill bit embedded in a patient's jaw. After months of nosebleeds and sinus infections, the patient finally discovered the bit.

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  • Online Dating Scams

    <a href="http://www.huffingtonpost.com/2012/05/15/online-romance-scams-cost-50-million-in-2011_n_1518162.html" target="_hplink">Fraudsters feigned interest</a> in lonely online romance seekers to rob victims of about $50 million last year.

  • Debt Collector Scams

    Phony debt collection agencies <a href="http://www.huffingtonpost.com/2012/04/11/ftc-busts-scam-debt-collector_n_1418582.html?ref=business&ir=Business" target="_hplink">have pressured victims</a> into giving up millions of dollars. The Federal Trade Commission recently closed down two California-based <a href="http://www.huffingtonpost.com/2012/02/21/ftc-indian-call-center-fraud-debt-collectors_n_1289751.html" target="_hplink">companies with call centers in India</a> after they defrauded Americans out of $5 million over the past two years.

  • Online Marketplace Scams

    Craigslist and eBay are a playground for scammers. Consumers have sent payments to <a href="http://www.huffingtonpost.com/2012/04/23/craigslist-scams-tips-losing-money_n_1445763.html" target="_hplink">places like Nigeria </a>for items advertised online only to discover they have been scammed. Last year, Romanians pretending to be U.S. citizens put fake ads for pricey items on eBay and Craigslist, <a href="http://www.huffingtonpost.com/2012/04/23/craigslist-scams-tips-losing-money_n_1445763.html" target="_hplink">defrauding Americans out of more than $100 million. </a>

  • Prize Money Scams

    <a href="http://www.huffingtonpost.ca/2012/04/28/lottery-scam-probe-nets-2_n_1460916.html" target="_hplink">Canadian police arrested a man </a>who tried to take a $70,000 processing fee from an elderly Californian woman who believed she was going to win a $7.5 million lottery prize in April. More recently,<a href="http://www.huffingtonpost.com/2012/05/17/jamaica-lottery-scam-fraud-suspects-arrested_n_1525498.html" target="_hplink"> eight Jamaican swindlers accused</a> of duping Americans in lottery scams were also arrested.

  • Charity Scams

    Fake charity organizations come out of the woodwork to exploit the generosity of others, <a href="http://www.huffingtonpost.com/2012/03/09/tornado-relief-fraud-scam_n_1334853.html" target="_hplink">especially during times of disaster.</a> Most recently, an organization that claims to help disabled veterans called Disabled Veterans National Foundation (DVNF) <a href="http://www.huffingtonpost.com/2012/05/08/charity-fraud-disabled-national-veterans-foundation_n_1499314.html" target="_hplink">took millions of dollars from donors</a> without spending the money on veterans.

  • Mortgage Foreclosure Scams

    Scammers targeting struggling homeowners have offered false services to help with mortgage settlements. Mortgage foreclosure scams have shot up <a href="http://www.huffingtonpost.com/2012/04/16/mortgage-foreclosure-scams_n_1429805.html" target="_hplink">60 percent in 2012 as new federal programs</a> for mortgages have provided avenues for fraudsters to exploit.

  • Travelling Relative Scams

    Scam complaints related to travelling surged right before <a href="http://www.huffingtonpost.com/2012/04/11/spring-break-travel-scams_n_1418954.html" target="_hplink">spring break last year. Crooks defrauded</a> grandparents out of money when their grandchildren were travelling abroad. The scammers, who find out about the travel plans from places like social media sites, pretend to be the grandchild asking for wire transfers on the phone. The scams have involved scammers pretending in an email to be a victim's travelling relative who has recently been mugged or has lost their passport.

  • Food Scams

    Although there isn't much data on how often it occurs, food scams can pose a tremendous<a href="http://www.huffingtonpost.com/2012/04/20/food-fraud-hoax-grocery-store_n_1439995.html#s889480&title=Milk_" target="_hplink"> health risk. The chances</a> of dilution and counterfeiting increase when food is imported from other countries, and some foods like fish and olive oil are particularly prone to adulteration.

  • Online Prescription Drug Scams

    Scammers have sold drugs to online consumers and then posed as government agents asking the buyers to pay money to <a href="http://www.huffingtonpost.com/2012/04/12/online-prescription-drug-scam_n_1420776.html" target="_hplink">avoid jail time. A Texas woman </a>killed herself after being caught up in one of these drug schemes.

  • Credit Card Scams

    Credit card breaches allow fraudsters to make charges on other peoples' cards after getting a hold of numbers. Global Payments Inc., a third party payment processing service for MasterCard and Visa, made headlines in April for reporting that over a million card numbers had been compromised from their system, <a href="http://news.cnet.com/8301-1009_3-57407981-83/global-payments-calls-data-breach-contained/" target="_hplink">according to CNET.</a>