diff --git a/odoo/api.py b/odoo/api.py
index ab96c9f64fd..432d5c5875d 100644
--- a/odoo/api.py
+++ b/odoo/api.py
@@ -448,7 +448,6 @@ class Environment(Mapping):
         self.cache = envs.cache
         self._cache_key = (cr, uid, su)
         self._protected = StackMap()                # {field: ids, ...}
-        self.dirty = defaultdict(set)               # {record: set(field_name), ...}
         self.all = envs
         envs.add(self)
         return self
@@ -570,7 +569,6 @@ class Environment(Mapping):
                 yield
             finally:
                 self.all.in_draft = False
-                self.dirty.clear()
 
     @property
     def in_draft(self):
diff --git a/odoo/fields.py b/odoo/fields.py
index 02d1e3ea21b..3e529c8f26f 100644
--- a/odoo/fields.py
+++ b/odoo/fields.py
@@ -1029,8 +1029,6 @@ class Field(MetaField('DummyField', (object,), {})):
                     if inv_recs:
                         for invf in record._field_inverses[self]:
                             invf._update(inv_recs, record)
-                # mark field as dirty
-                env.dirty[record].add(self.name)
 
             # determine more dependent fields, and invalidate them
             if self.relational:
diff --git a/odoo/models.py b/odoo/models.py
index e9c09e5625f..c71cebd2fd4 100644
--- a/odoo/models.py
+++ b/odoo/models.py
@@ -5042,26 +5042,6 @@ Fields:
         prefetch_ids = IterableGenerator(origin_ids, self._prefetch_ids)
         return self._browse(self.env, ids, prefetch_ids)
 
-    #
-    # Dirty flags, to mark record fields modified (in draft mode)
-    #
-
-    def _is_dirty(self):
-        """ Return whether any record in ``self`` is dirty. """
-        dirty = self.env.dirty
-        return any(record in dirty for record in self)
-
-    def _get_dirty(self):
-        """ Return the list of field names for which ``self`` is dirty. """
-        dirty = self.env.dirty
-        return list(dirty.get(self, ()))
-
-    def _set_dirty(self, field_name):
-        """ Mark the records in ``self`` as dirty for the given ``field_name``. """
-        dirty = self.env.dirty
-        for record in self:
-            dirty[record].add(field_name)
-
     #
     # "Dunder" methods
     #