diff --git a/packages/core/src/helpers/index.ts b/packages/core/src/helpers/index.ts
index eecd100..02958c9 100644
--- a/packages/core/src/helpers/index.ts
+++ b/packages/core/src/helpers/index.ts
@@ -1,14 +1,15 @@
 import { style } from '@vanilla-extract/css';
+import * as childHelpers from './child';
 import Element, * as elements from './element';
-import * as logger from './logger';
 import * as error from './error';
+import * as logger from './logger';
 import Node, * as nodeHelpers from './node';
+import * as normalizeNode from './normlizeNode';
 import Path, * as pathHelpers from './path';
 import * as rangeHelpers from './range';
 import ReactEditor from './reactEditor';
-import * as transforms from './transform';
 import Text, * as textHelpers from './text';
-import * as childHelpers from './child';
+import * as transforms from './transform';
 
 export const helpers = {
   ReactEditor,
@@ -16,6 +17,7 @@ export const helpers = {
   logger,
   error,
   Node,
+  normalizeNode,
   Path,
   ...transforms,
   Text,
diff --git a/packages/core/src/helpers/normlizeNode/index.ts b/packages/core/src/helpers/normlizeNode/index.ts
new file mode 100644
index 0000000..b5b3578
--- /dev/null
+++ b/packages/core/src/helpers/normlizeNode/index.ts
@@ -0,0 +1,51 @@
+import { Editor, Element, Node, NodeEntry } from 'slate';
+import { warn } from '../logger';
+
+/**
+ *  Delete child of type other than received in argument.
+ */
+export const nestedElementNormalizeNode = (
+  editor: Editor,
+  entry: NodeEntry,
+  allowType: string | string[]
+) => {
+  let isRestricted: boolean = false;
+  const [node, path] = entry;
+  allowType = Array.isArray(allowType) ? allowType : [allowType];
+  const childEntryList = Array.from(Node.children(editor, path));
+  const childNodes = childEntryList.map((entry) => {
+    const [node] = entry;
+    return node;
+  });
+  const hasCurrentTypeChild = !!childNodes.find((child) => {
+    if (!Element.isElement(child)) {
+      return false;
+    }
+    return allowType.includes(child.type);
+  });
+  if (!hasCurrentTypeChild) {
+    editor.removeNodes({ at: path });
+    return true;
+  }
+
+  childEntryList.forEach((childEntry) => {
+    const [child, childPath] = childEntry;
+    if (!Element.isElement(child) || !allowType.includes(child.type)) {
+      warn({
+        messages: [
+          'Element removed.',
+          {
+            from: [node, path],
+            target: [child, childPath],
+          },
+        ],
+      });
+      editor.removeNodes({
+        at: childPath,
+      });
+      isRestricted = true;
+    }
+  });
+
+  return isRestricted;
+};
diff --git a/packages/element-list/src/list/index.ts b/packages/element-list/src/list/index.ts
index 72f2764..5aa0fd3 100644
--- a/packages/element-list/src/list/index.ts
+++ b/packages/element-list/src/list/index.ts
@@ -10,27 +10,11 @@ const element: Element<Attributes> = {
   editable,
   toolbox,
   normalizeNode: (editor, entry) => {
-    // Allow only elements of type `list-item`.
-    let isNormalized: boolean = false;
-    const [node, path] = entry;
-    for (const [child, childPath] of helpers.Node.children(editor, path)) {
-      if (!helpers.Element.isElement(child) || child.type !== 'list-item') {
-        helpers.logger.warn({
-          messages: [
-            'Element removed.',
-            {
-              from: [node, path],
-              target: [child, childPath],
-            },
-          ],
-        });
-        editor.removeNodes({
-          at: childPath,
-        });
-        isNormalized = true;
-      }
-    }
-    return isNormalized;
+    return helpers.normalizeNode.nestedElementNormalizeNode(
+      editor,
+      entry,
+      'list-item'
+    );
   },
 };
 export default element;
diff --git a/packages/element-list/src/ordered/index.ts b/packages/element-list/src/ordered/index.ts
index 1f1f90e..aa209c7 100644
--- a/packages/element-list/src/ordered/index.ts
+++ b/packages/element-list/src/ordered/index.ts
@@ -10,27 +10,11 @@ const element: Element<Attributes> = {
   editable,
   toolbox,
   normalizeNode: (editor, entry) => {
-    // Allow only elements of type `list-item`.
-    let isNormalized: boolean = false;
-    const [node, path] = entry;
-    for (const [child, childPath] of helpers.Node.children(editor, path)) {
-      if (!helpers.Element.isElement(child) || child.type !== 'list-item') {
-        helpers.logger.warn({
-          messages: [
-            'Element removed.',
-            {
-              from: [node, path],
-              target: [child, childPath],
-            },
-          ],
-        });
-        editor.removeNodes({
-          at: childPath,
-        });
-        isNormalized = true;
-      }
-    }
-    return isNormalized;
+    return helpers.normalizeNode.nestedElementNormalizeNode(
+      editor,
+      entry,
+      'list-item'
+    );
   },
   insertBreak: (editor, nodeEntry) => {
     const [node, path] = nodeEntry;
diff --git a/packages/element-list/src/todo/index.ts b/packages/element-list/src/todo/index.ts
index 2d471ec..45e184d 100644
--- a/packages/element-list/src/todo/index.ts
+++ b/packages/element-list/src/todo/index.ts
@@ -10,30 +10,11 @@ const element: Element<Attributes> = {
   editable,
   toolbox,
   normalizeNode: (editor, entry) => {
-    // Allow only elements of type `todo-list-item`.
-    let isNormalized: boolean = false;
-    const [node, path] = entry;
-    for (const [child, childPath] of helpers.Node.children(editor, path)) {
-      if (
-        !helpers.Element.isElement(child) ||
-        child.type !== 'todo-list-item'
-      ) {
-        helpers.logger.warn({
-          messages: [
-            'Element removed.',
-            {
-              from: [node, path],
-              target: [child, childPath],
-            },
-          ],
-        });
-        editor.removeNodes({
-          at: childPath,
-        });
-        isNormalized = true;
-      }
-    }
-    return isNormalized;
+    return helpers.normalizeNode.nestedElementNormalizeNode(
+      editor,
+      entry,
+      'todo-list-item'
+    );
   },
 };
 
diff --git a/packages/element-note/src/container/index.ts b/packages/element-note/src/container/index.ts
index 6ff8a7d..0af7aa7 100644
--- a/packages/element-note/src/container/index.ts
+++ b/packages/element-note/src/container/index.ts
@@ -10,7 +10,11 @@ const element: Element<Attributes> = {
   editable,
   toolbox,
   normalizeNode: (editor, entry) => {
-    return helpers.childHelpers.restrictChild(editor, entry, 'note-body');
+    return helpers.normalizeNode.nestedElementNormalizeNode(
+      editor,
+      entry,
+      'note-body'
+    );
   },
 };
 
diff --git a/packages/element-toggle/src/container/index.ts b/packages/element-toggle/src/container/index.ts
index 15a51d4..92a9942 100644
--- a/packages/element-toggle/src/container/index.ts
+++ b/packages/element-toggle/src/container/index.ts
@@ -10,30 +10,10 @@ const element: Element<Attributes> = {
   editable,
   toolbox,
   normalizeNode: (editor, entry) => {
-    // Allow only elements of type `list-item`.
-    let isNormalized: boolean = false;
-    const [node, path] = entry;
-    for (const [child, childPath] of helpers.Node.children(editor, path)) {
-      if (
-        !helpers.Element.isElement(child) ||
-        (child.type !== 'toggle-head' && child.type !== 'toggle-body')
-      ) {
-        helpers.logger.warn({
-          messages: [
-            'Element removed.',
-            {
-              from: [node, path],
-              target: [child, childPath],
-            },
-          ],
-        });
-        editor.removeNodes({
-          at: childPath,
-        });
-        isNormalized = true;
-      }
-    }
-    return isNormalized;
+    return helpers.normalizeNode.nestedElementNormalizeNode(editor, entry, [
+      'toggle-head',
+      'toggle-body',
+    ]);
   },
 };
 export default element;