Dwayne 'The Rock' Johnson says he showers 3 times a day. That's too much for most people, a doctor says.

• Dwayne "The Rock" Johnson said he showered three times a day, exfoliating and singing each time.
• Johnson joined the conversation after Ashton Kutcher and Mila Kunis said they didn't bathe often.
• A doctor told Insider that a routine like Johnson's could dry out the skin.

After Ashton Kutcher and Mila Kunis said they didn't bathe their children or themselves daily, Dwayne "The Rock" Johnson said he showered three times a day. But a doctor says that cleaning yourself too often could have negative health effects.

"Taking a bath or shower can remove the healthy oils on your skin and hair, not to mention the good bacteria that keep your skin microbiome healthy," said Jaydeep Tripathy, a primary-care doctor with Doctor Spring.

Most adults and kids benefit from having some bacteria on their skin. Frequently bathing or showering, especially with soaps, can disrupt the skin's microbiome, Tripathy told Insider.

The skin serves as a barrier to keep harmful pathogens out of the body. But if it becomes too dry, which can happen with frequent showering, it can crack and become less effective at keeping germs out.

Johnson - who has three daughters, ages 2, 6, and 19 - stepped into the hygiene debate on Friday in response to a fan's post on Twitter.

"Nope, I'm the opposite of a 'not washing themselves' celeb," he wrote.

Though he didn't comment on how often he bathed his young kids, Johnson shared his own routine.

"Shower (cold) when I roll outta bed to get my day rollin'. Shower (warm) after my workout before work. Shower (hot) after I get home from work. Face wash, body wash, exfoliate and I sing (off key) in the shower," he wrote.

Doctors say it's best not to overwash

Tripathy said Johnson's routine was probably overkill for most people.

"Unless you are dirty or sweaty, you won't need to bathe more than once a day," he said. "In fact, if you're living in an area where the weather and temperature do not make you sweaty and sticky, you might not need to take a bath every day."

Tripathy acknowledged that some people, including those like Johnson who exercise daily, might like having quick rinse-offs multiple times a day. Healthcare workers and others who might be exposed to the coronavirus or germs might shower more often during the pandemic, he added.

If you want to shower more frequently, stick to the basics and prioritize moisturizing, which can keep your skin healthy, Tripathy said. This also applies to kids - when you or your children get out of a shower or bath, be sure to apply lotion while the skin is still damp.