The short answer is no. Tap water in Cancun is not recommended for drinking, even for locals.
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Although there will be some bacteria in the water from the tap it is fine to brush your teeth with, even if you are at a place where you can't drink the tap water.
As a precaution you should not drink tap water in Mexico even if it's purified at the source. Most resorts and hotels provide bottled water or large jugs of purified water for you to refill your bottle. Velas Resorts stocks its suites with bottled water daily as included in it's all inclusive plan.
To the OP, in all seriousness, the water in Cancun is fine for bathing/showering; I wouldn't recommend you drink it though. It's not that the water is inherently unsafe it's that it almost certainly has minerals dissolved in it that your body isn't used to and may cause intestinal upset.
Use Bottled Water For BrushingWhen it comes right down to it, the amount of water you actually ingest while brushing your teeth is pretty small. So is the chance that the agua coming from your hotel sink has actually been purified, so don't take chances!
But if you're stuck wondering if it's safe to travel to Cancun, our answer is a definite yes! Since Cancun brings so much revenue to Mexico, they've got a vested interest in safety and security within the Hotel Zone. Even outside of that area, Cancun is still known as a safe city with a low crime rate.
Maroma Beach is located in Quintana Roo State, between Cancun and Playa del Carmen in the Yucatan Peninsula. It is on the Mexican Caribbean Coast, so expect gorgeous, crystal clear waters in every shade of blue — maybe even the clearest water in Mexico.
Dental problems are usually quite costly and difficult to treat in the United States, that is why many patients decide to travel to Mexico to treat these problems. Diseases such as periodontitis and the problems it leaves in the mouth, are treated with ozone so that in a short time it can help restore the mouth.
Exercise increased caution due to crime. Both violent and non-violent crime occur throughout Mexico City. Use additional caution, particularly at night, outside of the frequented tourist areas where police and security patrol more routinely. Petty crime occurs frequently in both tourist and non-tourist areas.