How can I seal ceramic tiles that have holes & pits for texture?

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Every hole gathers everything, food, bugs, greasy stuff, gross stuff u can't wipe out. I have to get a toothpick to dig krap out of them. The holes get bigger and grout dissolved. I'm sure it's unsanitary. I can't afford to get a new counter. How can I seal these holes?

q my old house has ceramic tile squares with holes and pits for texture

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