Plastic develops fine scratches that trap oils and bacteria beyond washing, a factor associated with feline chin acne in some cats.
Ceramic and stainless steel have dense, cleanable surfaces and are the safer daily choice; pick ceramic with intact glaze, since cracks harbor grime too.
Wash food bowls daily whatever the material, never leaving wet-food bowls overnight, and keep pet dish sponges separate to avoid cross-contamination.
If blackhead-like specks or redness appear on the chin, switch materials and tighten cleaning first; see a vet if it persists or pustules form, without squeezing at home.
